CA2561519A1 - Sperm dispersions for use in insemination - Google Patents

Sperm dispersions for use in insemination Download PDF

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CA2561519A1
CA2561519A1 CA002561519A CA2561519A CA2561519A1 CA 2561519 A1 CA2561519 A1 CA 2561519A1 CA 002561519 A CA002561519 A CA 002561519A CA 2561519 A CA2561519 A CA 2561519A CA 2561519 A1 CA2561519 A1 CA 2561519A1
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dispersion
sperm
combination
spermatozoa
cells
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CA2561519C (en
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Jeffrey A. Graham
Cindy L. Ludwig
Kathleen S. Crowley
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Inguran LLC
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Monsanto Technology Llc
Jeffrey A. Graham
Cindy L. Ludwig
Kathleen S. Crowley
Inguran, Llc
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K35/00Medicinal preparations containing materials or reaction products thereof with undetermined constitution
    • A61K35/12Materials from mammals; Compositions comprising non-specified tissues or cells; Compositions comprising non-embryonic stem cells; Genetically modified cells
    • A61K35/48Reproductive organs
    • A61K35/52Sperm; Prostate; Seminal fluid; Leydig cells of testes
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N1/00Preservation of bodies of humans or animals, or parts thereof
    • A01N1/02Preservation of living parts
    • A01N1/0205Chemical aspects
    • A01N1/021Preservation or perfusion media, liquids, solids or gases used in the preservation of cells, tissue, organs or bodily fluids
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01NPRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N1/00Preservation of bodies of humans or animals, or parts thereof
    • A01N1/02Preservation of living parts
    • A01N1/0205Chemical aspects
    • A01N1/021Preservation or perfusion media, liquids, solids or gases used in the preservation of cells, tissue, organs or bodily fluids
    • A01N1/0226Physiologically active agents, i.e. substances affecting physiological processes of cells and tissue to be preserved, e.g. anti-oxidants or nutrients
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P15/00Drugs for genital or sexual disorders; Contraceptives
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/06Animal cells or tissues; Human cells or tissues
    • C12N5/0602Vertebrate cells
    • C12N5/0608Germ cells
    • C12N5/061Sperm cells, spermatogonia
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N5/00Undifferentiated human, animal or plant cells, e.g. cell lines; Tissues; Cultivation or maintenance thereof; Culture media therefor
    • C12N5/06Animal cells or tissues; Human cells or tissues
    • C12N5/0602Vertebrate cells
    • C12N5/0608Germ cells
    • C12N5/0611Primordial germ cells, e.g. embryonic germ cells [EG]
    • CCHEMISTRY; METALLURGY
    • C12BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2500/00Specific components of cell culture medium
    • C12N2500/05Inorganic components
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/30Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis

Abstract

Processes of storing sorted and unsorted spermatozoa, in the form of a sperm dispersion, having reduced motility relative to endogenous ejaculated sperm are disclosed. The immotile spermatozoa of the dispersion tend to have a greater capacity for enduring the rigors associated with storage, transportation, and fertilization procedures. Processes for providing such sperm dispersions, for inseminating a female mammal with such sperm dispersions, as well as compositions and combinations comprising the sperm dispersions, are also disclosed.

Description

2 PCT/US2005/010599 SPERM DISPERSIONS FOR USE IN INSEMINATION
FIELD OF THE INVENTION
[0001] The present invention generally relates to a process of storing sperm cells. More specifically, the present invention relates to the process of storing sorted and unsorted spermatozoa having reduced motility relative to endogenous ejaculated sperm, a process for providing such sperm dispersions for inseminating a female mammal, a process for inseminating a female mammal using such sperm dispersions.
T~ T f~Y/7T7/1TTATT
[0002] The fertilization of animals by artificial insemination (AI) and embryo transplant following in vitro fertilization is an established practice. Because the viability and motility of the sperm used in these procedures affects the outcome of the procedures (i.e., whether the fertilization and insemination procedures successfully result in offspring), it is important that the sperm cells be able to survive the rigors often associated with the insemination process, including for example, the collection, storage, and transportation of the cells.
[0003] By way of example, in the livestock production industry, the ability to influence the reproductive outcome toward offspring having one or more preferred characteristics, such as offspring of a particular gender, is often desired. In order to effect such an outcome, semen samples from male mammals are collected, stained with a dye, subsequently sorted into X and Y chromosome-bearing cells, optionally stored for a period of time in a frozen or cooled state, and then transported to the location of breeding, where a female mammal is ultimately inseminated.
Each of the steps of this process places a stress on the sperm cells that decreases sperm cell viability or motility, particularly progressive motility.
[0004] Salisbury et al. describe a technique for the collection of ejaculated bovine semen directly into a diluent which inhibits cell motility and prevents the absorption of carbohydrates from the surrounding seminal plasma. 4dhen the ejaculate is collected into the diluent and the air phase above the liquid is replaced by gassing with 100% C02, the cells in the ejaculate became immotile.
As long as the cells remained in the diluent and air was excluded, the cells remained immotile for several hours at room temperature and for at least 8 days at 5°C.
SUMMARY OF THE INVENTION
[0005] Among the various aspects of the present invention is a process for rendering spermatozoa immotile for storage, transport, or fertilization in order to protect the spermatozoa from the rigors of the same. In one embodiment of the invention, therefore, a sperm dispersion, sometimes referred to a sperm suspension, is formed comprising spermatozoa and a composition that down-regulates carbohydrate uptake by the spermatozoa.
[0006] Briefly, therefore, the present invention is directed to a process for storing unsorted spermatozoa, the process comprising forming a sperm dispersion, the sperm dispersion comprising spermatozoa, a composition that induces sperm immotility, and an antibiotic, and storing the sperm dispersion.
[0007] The present invention is further directed to a process for storing sorted spermatozoa, the process comprising forming a sperm dispersion, the sperm dispersion comprising spermatozoa and a composition that that induces sperm immotility, sorting the sperm dispersion into separate populations, wherein the spermatozoa of one of the populations comprises at least about 65% X chromosome bearing sperm cells or at least about 65% Y chromosome bearing sperm cells, and storing the one population at a temperature of about -4°C to about 30°C.
[0008] The present invention is further directed to a process for inseminating a female mammal, the process comprising inseminating a female mammal with a sperm dispersion, the sperm dispersion comprising immotile spermatozoa and a composition that induces sperm immotility.
[0009] The present invention is further directed to a process for providing a fresh sperm dispersion for inseminating a female mammal, the process comprising forming a sperm dispersion, the sperm dispersion comprising spermatozoa and a composition that induces sperm immotility, placing the sperm dispersion in a container for shipment to a remote location, and shipping the sperm dispersion in the container to a remote location within about 24 hours after forming the sperm dispersion.
[0010] The present invention is further directed to a combination comprising an elongated container for use in the insemination of a female mammal, and a sperm dispersion, the sperm dispersion comprising immotile spermatozoa and a composition that that induces sperm immotility. The sperm dispersion is contained in the elongated container.
[0011] The present invention is further directed to a sperm dispersion comprising immotile spermatozoa, a composition that induces sperm immotility, and a cryopreservative. The sperm dispersion may also contain additives to enhance sperm viability, such as for example, an antibiotic, a growth factor, caproic acid, catalase, or a composition which regulates oxidation/reduction reactions intracellularly and/or extracellularly.
[0012] Other aspects and features of the invention will be in part apparent and in part pointed out hereinafter.
DETAILED DESCRIPTION OF THE INVENTION
[0013] Surprisingly, it has been determined that spermatozoa having reduced motility, and more particularly a temporarily induced immotility, relative to endogenous ejaculated spermatozoa (of the same species) tend to have a greater capacity for enduring periods of storage and transport without the necessity for freezing the spermatozoa. The spermatozoa may be maintained in a state of reduced motility from about the point at which they are collected from the source mammal until the insemination of a female mammal with the immotile spermatozoa. In a preferred embodiment, therefore, a particular concentration of fresh, unfrozen spermatozoa, either sorted or unsorted, may be prepared for storage, transport, or fertilization which have an increased number of viable cells or an increased number of motile sperm versus the same particular concentration of spermatozoa that have been frozen and subsequently thawed.
[0014] As a result of the increased viability of the spermatozoa in sperm dispersions, aliquots of sperm dispersions containing lesser densities of spermatozoa may be used for fertilization or insemination procedures, as a greater percentage of the cells contained in an aliquot of the dispersion (such as for example, the percentage of cells contained in an artificial insemination straw) will be viable, progressively motile, and therefore, potentially capable of fertilizing an egg. Likewise, because a lesser density of sperm cells within an aliquot of a dispersion are required for fertilization or insemination procedures, a single ejaculate, in the form of a sperm dispersion, may be divided into a greater number of aliquots for use in 5 fertilization or insemination procedures.
[0015] In accordance with the process of the present invention, a dispersion is formed containing spermatozoa _ and one or more compositions which inhibit the motility of the spermatozoa; such a state of inhibited motility sometimes being referred to as immotility or sperm quiescence. In general, the dispersions will contain spermatozoa in a density of at least about 1 X 103 sperm/ml, and more preferably in a density of at least about 0.1 x 106 sperm/ml of dispersion and generally not in excess of about 5 X 101° sperm/ml and more preferably generally not in excess of about 5 x 108 sperm/ml of dispersion. For example, in one embodiment the suspensions may contain spermatozoa in a "relatively low" density, i.e., in a density of less than about 1 X 10' sperm/ml, preferably less than about 1 X 106 sperm/ml, more preferably about 1 X 103 to about 5 X 106 sperm/ml, still more preferably about 1 X 103 to about 1 X 106 sperm/ml, even more preferably about 1 X 104 to about 1 X 105 sperm/ml, and most preferably about 1 X 105 sperm/ml of suspension. In an alternative embodiment, the suspensions may contain spermatozoa in an "intermediate" density, i.e., in a density of about 1 X 10' to about 1 X 108 sperm/ml of suspension. In yet another alternative embodiment, the suspensions may contain spermatozoa in a "relatively high" density, i.e., in a density of at least about 1 x 108 sperm/ml, preferably about 1 X 108 to about 5 X 101° sperm/ml, more preferably about 1.5 X 108 to about 2 X 101° sperm/ml, even more preferably about 1.5 X 108 to about 2 X lOa sperm/ml, and still more preferably about 1.5 X 108 sperm/ml of suspension. Thus, for example, in one embodiment the dispersion may contain at least about 0.04 x 106, at least about 1 x 106, at least about 1.5 x 106, at least about 2 x 106, at least about 3 x 106, at least about 0.5 x 10', at least about 1 x 10', at least about 2 x 10', at least about 3 x 10', at least about 4 x 10', at least about 5 x 10', at least about 6 x 10', at least about 7 x 10', at least about 8 x 10', at least about 9 x 10', or even at least about 12 x 10' sperm/ml of dispersion. In an alternative embodiment, the suspension may contain less than about 9 X 105, less than about 7 X 105, less than about 5 X 105, less than about 2 X 105, less than about 1 X 105, less than about 1 X 104, or even less than about 1 X 103 sperm/ml of suspension.
[0016] The density of spermatozoa may vary based upon a number of factors, including, for example, the species of the mammal from which the spermatozoa are obtained. For example, bovine spermatozoa may be in a dispersion at a higher density, but typically in a smaller volume, such as for example 0.5 x 106 sperm/ml to about 8 x 10' sperm/ml in a volume of about 0.5 ml to about 25m1. Swine spermatozoa, however, may be in a dispersion at a lower density, but typically in a greater volume, such as for example 0.04 x 106 sperm/ml to about 1 x 10' sperm/ml in a volume of about 50m1 to about 250m1.
[0017] The density of the spermatozoa in sperm dispersions may vary based upon individual mammal or species specific factors. Examples of such factors include, for example, the variations among different species of mammals, variations among the mammals of a single species, and even variations among different ejaculates of a single mammal.
[0018] The density of the spermatozoa in the sperm dispersions may also be artificially manipulated to achieve a dispersion of a specific spermatozoa density.
Manipulations to the density of spermatozoa in a sperm dispersion, for example, contained in an insemination straw, may be made based upon factors such as the temperature at which the dispersion may be stored, the length of the storage period, whether the spermatozoa in the sperm dispersion are sorted or unsorted, the species of the male mammal from which the spermatozoa were collected, the fertility of the mammal from which the spermatozoa were collected, and the species of the female mammal to be inseminated.
[0019] The density of spermatozoa in a sperm dispersion may also be affected by the method in which the sperm cells may be subsequently enriched or sorted. For example, the sperm cells may be sorted using flow cytometry as described in greater detail below. In such an instance, the buffered sperm suspension may typically be of an "intermediate" or "relatively high" density of spermatozoa.
Other sorting or enrichment techniques may benefit from a lesser density of spermatozoa, such as a "relatively low"
density of spermatozoa, labeled with a marker, such as for example the dyes and labels described herein.
[0020] The density of the spermatozoa in a sperm dispersion may also be affected by simply concentrating the spermatozoa, such as for example, by centrifugation. In such an instance, the dispersion would substantially separate into what is commonly referred to as a pellet (a mass of cells containing a minimal amount of fluid) and a supernatant (a soluble liquid fraction). The supernatant may then be decanted without disruption of the pellet, thereby resulting in a relatively dense pellet of sperm cells containing a minimal amount of the inhibitory buffer, the effect being to reduce the volume of the dispersion without changing the components of the dispersion. As a result, the sperm cells of the pellet remain in an immotile state.
[0021] In a preferred embodiment, spermatozoa in dispersions of the present invention behave, in certain respects, in a manner characteristic of epididymal spermatozoa; for example, the spermatozoa may be immotile, may have a lesser rate of endogenous respiration, or may have a greater rate of aerobic glycolysis as compared to freshly ejaculated spermatozoa. Advantageously, the inhibited spermatozoa have the ability, upon separation from the inhibitor(s), to behave in a manner characteristic of ejaculated spermatozoa (and not characteristic of epididymal spermatozoa) with respect to motility and, in one embodiment, with respect to motility and respiration.
[0022] In one embodiment, for example, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS sperm analysis (Hamilton Thorne HTM-IVOS computer assisted sperm analysis system Hamilton-Thorne Research, Beverly MA) of at least about 50%
of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. Preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS sperm analysis, of at least about 60% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. More preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS sperm analysis, of at least about 70% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. Still more preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS
sperm analysis, of at least about 80% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. Even more preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS sperm analysis, of at least about 90% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. Even more preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by HTM-IVOS
sperm analysis, of at least about 95% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species. Most preferably, the motility inhibitor reduces path velocity, progressive velocity, or both, as measured by an HTM-IVOS sperm analysis, of at least about 99% of the sperm cells in the dispersion relative to the path velocity, progressive velocity, or both of sperm cells in a fresh ejaculate of the same species.
[0023] In addition to or in lieu of an inhibitory buffer, the temperature of the sperm cells or the immediate environment surrounding the sperm cells (i.e., a sperm dispersion) may solely be reduced to affect the motility of the cells. Such a reduction in temperature will generally increase immotility. Moreover, for example, the reduction of temperature of the sperm cells or the sperm dispersion may permit a reduction in the concentration of inhibitor used to induce immotility. Accordingly, the sperm dispersion may be at a temperature not in excess of 5°C;
preferably between about 0°C and about 5°C; more preferably between about 3°C and about 5°C; and most preferably about 5 5°C. Alternatively, the sperm dispersion may be at a temperature within the range of about 4°C to about 50°C;
preferably from about 7°C to about 43°C; more preferably from about 10°C to about 39°C; still more preferably from about 15°C to about 30°C; even more preferably from about 10 17°C to about 25°C; and most preferably at about 18°C.
Preferably, however, the sperm cells are not exposed to temperatures that substantially detrimentally affect the viability of the cells.
[0024] The inhibitor may be any of a range of compositions having a depressive effect upon sperm motility. Such compositions include, for example, sodium/potassium ATPase inhibitors, such as, ouabain;
compositions comprising potassium ions; and compositions comprising potassium and sodium ions. For example, relatively high concentrations of potassium ions in the dispersion tend to depress sperm motility. In general, therefore, it is preferred that the dispersion contain a source of potassium ions and that the potassium concentration in the dispersion be at least about 0.05 moles/L. More preferably, the potassium concentration is at least about 0.05 moles/L to about 0.5 moles/L. Still more preferably, the potassium concentration is at least about 0.1 moles/L to about 0.3 moles/L. Most preferably, the potassium concentration is at about 0.173 moles/L.
Such dispersions will typically, but not necessarily, also contain a source of sodium ions. When sodium is present, the molar ratio of potassium to sodium is generally equal to or greater than 1:1, respectively, but will generally not exceed a molar ratio of 8:1. Preferably, the molar ratio of potassium to sodium is at least about 1.25:1.
Still more preferably, the molar ratio of potassium to sodium is at least about 1.5:1. Still more preferably, the molar ratio of potassium to sodium is at least about 1.75:1. Still more preferably, the molar ratio of potassium to sodium is at least about 1.78:1. In one particular embodiment, the molar ratio of potassium to sodium is at least about 2:1. In yet another embodiment, the molar ratio of potassium to sodium is at least about 3:1. In still another embodiment, the molar ratio of potassium to sodium is at least about 4:1. In still another embodiment, the molar ratio of potassium to sodium is at least about 5:1. In still another embodiment, the molar ratio of potassium to sodium is at least about 6:1.
In still another embodiment, the molar ratio of potassium to sodium is at least about 7:1. In still another embodiment, the molar ratio of potassium to sodium is at least about 8:1.
[0025] The sperm dispersion may additionally comprise an ion or source of carbon dioxide capable of increasing or aiding in the inhibition of sperm motility. This source of carbon dioxide may be in the form of a component of the dispersion, such as, for example, one or more carbonates, or may be in the form an atmosphere of gas above the dispersion having a positive partial pressure of carbon dioxide in excess of the natural partial pressure of carbon dioxide in ambient air. Alternatively, the source of carbon dioxide may be a combination of both a component of the dispersion and an atmosphere of gas above the dispersion having a positive partial pressure of carbon dioxide in excess of the natural partial pressure of carbon dioxide in ambient air.
[0026] In one presently preferred embodiment, the sperm dispersion comprises NaHC03 and KHC03, thereby providing a source of potassium and sodium ions as well as a partial pressure of carbon dioxide. For example, in one presently preferred embodiment, the dispersion comprises NaHC03 and KHC03 in an aqueous solution, preferably NaHC03, KHC03, and C6H80~~H20 in water. In general, the KHC03 concentration in the dispersion may be at least about 0.05 moles/L. More preferably, the KHC03 concentration is at least about 0.05 moles/L to about 0.5 moles/L. Still more preferably, the KHC03 concentration is at least about 0.1 moles/L to about 0.3 moles/L. Most preferably, the KHC03 concentration is at about 0.173 moles/L. When NaHC03 is present, the molar ratio of KHC03 to NaHC03 may be as described above with respect to the molar ratio of potassium to sodium.
[0027] When C6HgO~~HzO is present in the dispersion, the molar ratio of KHC03 to NaHC03 may be as described above . The molar ratio of KHC03 to C6H80~ ~ H20 may generally be equal to or greater than 1:1, respectively, but will generally not exceed a molar ratio of 8:1. Preferably, the molar ratio of KHC03 to C6H80~ ~ H20 is from at least about 1.25:1. Still more preferably, the molar ratio of KHC03 to C6HeO~~H20 is at least about 1.5:1. Still more preferably, the molar ratio of KHC03 to CSHgO~ ~ H20 is at least about 1.75:1. In one particular embodiment, the molar ratio of KHC03 to C6Hg0~ ~ H20 is at least about 1 . 78 : 1 . In another particular embodiment, the molar ratio of KHC03 to C6H80~~H20 is at least about 2:1. In yet another embodiment, the 3 0 molar ratio of KHC03 to C6HgO~ ~ H20 is at least about 3 : 1 . In still another embodiment, the molar ratio of KHC03 to C6HgO~~H20 is at least about 4:1. In still another embodiment, the molar ratio of KHC03 to C6HgO-,~H20 is at least about 5:1. In still another embodiment, the molar ratio of KHC03 to C6H80~ ~ H20 is at least about 6 : 1 . In still another embodiment, the molar ratio of KHC03 to C6H80~ ~ HZO is at least about 7:1. In still another embodiment, the molar ratio of KHC03 to C6H80~ ~ H20 is at least about 8 : 1 . In one particularly preferred embodiment, the dispersion is formed using an inhibitory buffer comprising 0.097 moles/L of NaHC03, 0.173 moles/L of KHC03, 0.090 moles/L C6Ha0~'H20 in water as disclosed in Salisbury & Graves, J. Reprod.
Fertil., 6:351-359 (1963). The sperm cells will generally remain quiescent as long as they are exposed to the motility inhibitor(s).
[0028] Experimental evidence to date further suggests that the overall health and other vital characteristics of sperm cells may be improved if the cell dispersion is maintained under an atmosphere that reduces or prevents the diffusion of oxygen into the dispersion. This can be achieved by replacing the atmosphere of gas above the sperm dispersion with an atmosphere having an enhanced partial pressure of, for example, carbon dioxide, nitrogen, or other inert gases relative to ambient air. In a preferred embodiment, the atmosphere over the dispersion has a partial pressure of carbon dioxide of at least about O.OOOlatm, but generally less than about 5atm at atmospheric pressure. In one embodiment, the partial pressure of carbon dioxide is about 0.5atm to about 2atm at atmospheric pressure; in another embodiment, the partial pressure of carbon dioxide is about 0.9atm to about 2atm at atmospheric pressure; in another embodiment, the partial pressure of carbon dioxide is about 0.95atm to about 2atm at atmospheric pressure.
[0029] Quiescent or immotile cells may be returned to an active state by separating the cells from the motility inhibitor or exposing them to air. In addition, the initiation of an active state may be further induced by the dilution of the cells in a physiological saline (Salisbury et al., 1963) or a buffer such as TCA buffer or PBS.
Typically, at least about 20%, preferably at least about 50%, more preferably at least about 60%, still more preferably at least about 70%, even more preferably at least about 80%, even more preferably at least about 90%, still more preferably at least about 95%, and most preferably at least about 99% of the cells returned to an active state (i.e., reactivated cells) will have a path velocity, progressive velocity, or both, as measured by HTM-IVOS sperm analysis, that is at least about 50%, preferably at least about 60%, more preferably at least about 70%, still more preferably at least about 80%, even more preferably at least about 90%, even more preferably at least about 95%, and most preferably at least about 99% of the path velocity, progressive velocity, or both of the sperm cells prior to being combined with the motility inhibitor (i.e., of sperm cells of a fresh ejaculate).
[0030] The present processes may be used to store, to transport, and to fertilize with both sorted and unsorted spermatozoa. If unsorted spermatozoa are to be stored according to the present process, the spermatozoa may be collected directly into a vessel containing the motility inhibitor to form the sperm dispersion. The sperm dispersion may also contain at least one antibiotic. The sperm dispersion may subsequently be stored for a desired period of time.
[0031] If sorted spermatozoa are to be stored according to the present process, the spermatozoa may be collected directly into a vessel containing the motility inhibitor to form the sperm dispersion. Once collected, 5 the sperm cells in the dispersion are sorted according to a multi-step process. In general, the cell sorting process comprises a series of discrete steps, i.e., staining of the collected cells, sorting of the cells, collection of the sorted cells, and optionally, cryoextension of the sorted 10 cells. The sorted cells may then be stored for a desired period of time. Advantageously, the motility inhibitor may be included in sperm dispersions formed or employed in one or more of these steps of the cell sorting process.
I. Collection of the Cell Sample 15 [0032] Whether the inventive process is used to store sorted or unsorted sperm, intact viable bovine, porcine, equine, swine, or other mammalian sperm cells, may be collected and contacted with the motility inhibitor.
Various methods of collection of viable sperm are known and include, for example, the gloved-hand method, use of an artificial vagina, and electro-ejaculation. As an example, a bovine semen sample, typically containing about 0.5 to about 10 billion sperm cells per milliliter, may be collected directly from the source mammal, or from more than one source mammal of the same species, into a vessel containing a motility inhibitor to form a sperm dispersion.
Alternatively, the semen sample may be collected into an empty vessel and then subsequently contacted with the motility inhibitor within several minutes to hours after collection to form the sperm dispersion.

[0033] In addition to a buffer, the sperm dispersion may also contain a range of additives to enhance sperm viability. Exemplary additives include sterols, lipids, and fatty acids, protein sources, antibiotics, growth factors, caproic acid, catalase, Caprogen, (caproic acid, catalase, and 5% egg yolk), and compositions which regulate oxidation/reduction reactions intracellularly and/or extracellularly.
[0034] Exemplary protein sources include egg yolk, egg yolk extract, milk (including heat homogenized and skim), milk extract, soy protein, soy protein extract, serum albumin, bovine serum albumin, human serum substitute supplement, seminal proteins, such as, for example, whole seminal plasma or seminal plasma extracts (see, for example, Parks et al., Sperm Membrane Phospholipid Peroxidation and Fragmentation: Effects on Sperm Function and Role of Seminal Plasma PAF-Acetylhydrolase, Proceedings of the 16th Technical Conference on Artificial Insemination & reproduction, 1996, the content of which is hereby incorporated herein by reference), and combinations thereof. Albumin, and more particularly bovine serum albumin (BSA), is a preferred protein source. For example, if included, BSA may be present in the sperm dispersion in an amount of less than about 5.0% (w/v), preferably less than about 2% (w/v), more preferably less than about 1% (w/v), and most preferably in an amount of about 0.1% (w/v) .
[0035] The use of a protein source, such BSA, alone may initiate the process of capacitation in a percentage of the sperm cells in the dispersion. It is preferred that this process take place in the female reproductive tract.
Therefore, in order to inhibit the initiation of capacitation during dilution, as well as during the subsequent staining and sorting, an alternative protein source or a protein substitute may be included in the sperm dispersion. The alternative protein source or protein substitute possess the advantageous effects of a typical protein source, such as BSA, in addition to the ability to inhibit the initiation of capacitation in a larger percentage of the cells in the sperm dispersion. Examples of a alternative protein sources includes human serum substitute supplement (SSS) (Irvine Scientific, Santa Ana, CA) and cholesterol enhanced BSA, while an example of a protein substitute includes a polyvinyl alcohol, such as for example, a low to medium viscosity polyvinyl alcohol generally of a molecular weight of about 30,000 to about 60,000. Generally, if included, these compositions will be present in the same amounts as disclosed above with respect to BSA, with the total albumin content of the buffer or buffered solution generally not exceeding about 5.0% (w/v).
[0036] Exemplary compositions which regulate oxidation/reduction reactions intracellularly and/or extracellularly include for example pyruvate, vitamin K, lipoic acid, glutathione, flavins, quinones, superoxide dismutase (SOD), and SOD mimics. If included in the sperm dispersion, such a composition may be present in a concentration sufficient to effect the protective effect without detrimentally affecting sperm health. Exemplary concentration ranges include from about 10~M to about 20mM
depending upon such factors as the particular composition being used or the concentration of sperm in the dispersion.
For example, pyruvate may be present in the sperm dispersion in a concentration from about 1mM to about 20mM, preferably from about 5mM to about lSmM, and more preferably about lOmM. Vitamin K may be present in the sperm dispersion in a concentration from about 1~M to about 100~M, preferably from about 10~M to about 100~M, and more preferably about 100~M. Lipoic acid may be present in the sperm dispersion in a concentration from about O.lmM to about lmM, preferably from about 0.5mM to about lmM, and more preferably about lmM.
[0037] An antibiotic may be included in the sperm dispersion in order to inhibit bacterial growth. Exemplary antibiotics include, for example, tylosin, gentamicin, lincomycin, spectinomycin, Linco-Spectin~ (lincomycin hydrochloride-spectinomycin), penicillin, streptomycin, ticarcillin, polymyxin B, or any combination thereof. If included, the antibiotics may be present in a concentration of about 50~g to about 800~g per ml of semen, regardless of whether the semen is neat, buffered, or contains additional substances, such as for example, any of the additives mentioned herein. The Certified Semen Services (CSS) and National Association of Animal Breeders (NAAB) have promulgated guidelines regarding the use of antibiotics with respect to sperm collection and use.
[0038] A growth factor may be added to the sperm dispersion in order to help maintain the viability of the sperm cells. Exemplary growth factors include, for example, transforming growth factors ("TGF), such as, for example, TGF~i-1 and TGF,~-2, and insulin-like growth factors ("IGF"), such as for example, IGF-1. Generally, TGF may be present in the sperm dispersion in the form of TGF~i-1 in a concentration of about O.lng/L to about 10~,g/L or as TGF,~-2 in a concentration of about 0.lng/L to about 200ng/L, and IGF may be present in the sperm dispersion in the form of IGF-1 in a concentration of about O.lng/L to about 50~,g/L.
The use of such growth factors is well known in the art and is disclosed, for example, in U.S. Patent Application Publication No. 2003/0157473, the content of which is hereby incorporated herein by reference.
[0039] Once collected, the cells may be stored in a quiescent state for a desired period of time or alternatively, may be used within several hours. In either event, the cells may be used, for example,,in a staining process, a sorting process, or a fertilization process.
A. Sorting of Collected Cells (i) Staining of the Cells [0040] A motility inhibitor may be used to render cells immotile during staining of the cells. A process of staining sperm cells typically comprises the formation of a staining mixture, sometimes referred to as a labeling mixture, containing intact viable sperm cells, a motility inhibitor, and a dye, sometimes referred to as a label. In this aspect of the invention, the motility inhibitor may be contacted with the sperm cells to form a sperm dispersion, and then the dispersion contacted with a DNA selective dye.
In this embodiment, the sperm source may be neat semen, or alternatively, a sperm-containing semen derivative obtained by centrifugation or the use of other means to separate semen into fractions.
[0041] In an alternative embodiment, the dye may be combined with a motility inhibitor, thereby forming a dye solution. Thus, for example, dye in the form of a neat solid, including a free-flowing powder, or a liquid composition may be combined with the inhibitor to form a dye solution, which may then be combined with neat semen, a sperm dispersion, or a sperm-containing semen derivative.
[0042] In any event, the sperm cells will generally remain quiescent as long as they are maintained in the inhibitor. (Salisbury et al., 1963) Preferably, however, the staining mixture is maintained under an atmosphere having an enriched partial pressure of carbon dioxide relative to ambient air; for example, providing an atmosphere over the staining mixture which is 99%+ C02 is 5 generally preferred.
[0043] The pH of the staining mixture may be maintained at any of a range of pH's; typically this will be in the range of about 5.0 to about 9Ø For example, the staining mixture may be maintained at a "slightly acid"
10 pH, i.e., from about 5.0 to about 7Ø In this embodiment, the pH is preferably from about 6.0 to about 7.0, more preferably from about 6.0 to about 6.5, and most preferably at about 6.2. Alternatively, the staining mixture may be maintained at a "slightly basic" pH, i.e., from about 7.0 15 to about 9Ø In this embodiment, the pH is preferably from about 7.0 to about 8.0, more preferably from about 7.0 to about 7.5, and most preferably at about 7.35.
[0044] The staining mixture may be formed by using one or more UV or visible light excitable, DNA selective dyes 20 as previously described in U.S. Patent No. 5,135,759 and WO 02/41906, the content of each of which is hereby incorporated herein by reference. Exemplary UV light excitable, selective dyes include Hoechst 33342 and Hoechst 33258, each of which is commercially available from Sigma-Aldrich (St. Louis, MO). Exemplary visible light excitable dyes include SYBR-14, commercially available from Molecular Probes, Inc. (Eugene, OR) and bisbenzimide-BODIPY~ conjugate 6-{ [3- ( (2Z) -2-{ [1- (difluoroboryl) -3, 5-dimethyl-1H-pyrrol-2-yl]methylene}-2H-pyrrol-5-yl)propanoyl]amino}-N-[3-(methyl{3-[({4-[6-(4-methylpiperazin-1-yl)-1H,3'H-2,5'-bibenzimidazol-2'-yl]phenoxy~acetyl)amino]propyl}amino)propyl]hexanamide ("BBC") described in WO 02/41906. Each of these dyes may be used alone or in combination; alternatively, other cell permeant UV and visible light excitable dyes may be used, alone or in combination with the aforementioned dyes, provided the dye does not detrimentally affect the viability of the sperm cells to an unacceptable degree when used in concentrations which enable sorting or enrichment as described elsewhere.
[0045] Alternatively, the staining mixture may be formed using fluorescent polyamides, and more specifically polyamides with a fluorescent label or reporter conjugated thereto. Such labels will fluoresce when bound to nucleic acids. Examples of polyamides with a fluorescent label or reporter attached thereto include, for example, those disclosed in Best et al., Proc. Natl. Acad. Sci. USA, 100(21): 12063-12068 (2003); Gygi, et al., Nucleic Acids Res., 30(13): 2790-2799 (2002); U.S. Patent No. 5,998,140;
U.S. Patent No. 6,143,901; and U.S. Patent No. 6,090,947, the content of each of which is hereby incorporated herein by reference.
[0046] Fluorescent nucleotide sequences may also be used to label the sperm cells. Such nucleotide sequences fluoresce when hybridized to a nucleic acid containing a target or complementary sequence, but are otherwise non-fluorescent when in a non-hybridized state. Such oligonucleotides are disclosed, for example, in U.S. Patent Application Publication No. 2003/0113765 (hereby incorporated herein by reference).
[0047] Sex specific antibodies may also be used to label the sperm cells in a staining mixture. In this embodiment, for example, a sex specific antibody may be conjugated with a fluorescent moiety (or equivalent .reporter molecule). Because the antibody binds to antigens present on only an X chromosome-bearing or, alternatively, a Y chromosome-bearing cell, such cells can be selectively identified based upon their fluorescence (versus the non-fluorescence of an unlabeled cell). Moreover, more than one sex specific antibody, each antibody having a different fluorescent moiety attached thereto, may be used simultaneously. This allows for differentiation of X chromosome-bearing and Y chromosome-bearing cells based upon the differing fluorescence of each.
[0048] Luminescent, color-selective nanocrystals may also be used to label sperm cells in a staining mixture.
Also referred to as quantum dots, these particles are well known in the art, as demonstrated by U.S. Patent No.
6,322,901 and U.S. Patent No. 6,576,291, each of which is hereby incorporated herein by reference. These nanocrystals have been conjugated to a number of biological materials, including for example, peptides, antibodies, nucleic acids, streptavidin, and polysaccharides, (see, for example, U.S. Patent Nos. 6,207,392; 6,423,551; 5,990,479, and 6,326,144, each of which is hereby incorporated herein by reference), and have been used to detect biological targets (see, for example, U.S. Patent Nos. 6,207,392 and 6,247,323, each of which is hereby incorporated herein by reference) .
[0049) The preferred concentration of the DNA
selective or of any other type of dye in the staining mixture is a function of a range of variables which include the permeability of the cells to the selected dye, the temperature of the staining mixture, the amount of time allowed for staining to occur, the concentration of sperm, and the degree of enrichment desired in the subsequent sorting or enrichment step. In general, the dye concentration is preferably sufficient to achieve the desired degree of staining in a reasonably short period of time without substantially detrimentally affecting sperm viability. For example, the concentration of Hoechst 33342, Hoechst 33258, SYBR-14, or BBC in the staining mixture will generally be between about 0.1~.M and about 1. OM, preferably from about 0.1~.M to about 1000~,M, more preferably from about 100~,M to about 500~,M, still more preferably from about 200~,M to about 500~,M, and even more preferably from about 300~,M to about 450~M. Accordingly, under one set of staining conditions, the concentration of Hoechst 33342 is preferably about 350~,M. Under another set of staining conditions, the concentration of Hoechst 33342 is about 400~M. Under still another set of staining conditions the concentration is preferably about 450~,M.
[0050] As another example, the concentration of a fluorescent polyamide, such as for example, those described in U.S. Application Publication No. 2001/0002314, will generally be between about O.l~,M and about lmM, preferably from about 1~,M to about lmM, more preferably about 5~,M to about 100~,M, even more preferably about 10~,M.
[0051] Optionally, the staining mixture may also contain additives to enhance sperm viability. Exemplary additives include an antibiotic, a growth factor or a composition which regulates oxidation/reduction reactions intracellularly and/or extracellularly as discussed above with respect to cell sample collection. These additives may be added to the collection fluid in accordance therewith.
[0052] Once formed, the staining mixture may be maintained at any of a range of temperatures; typically, this will be within a range of about 4°C to about 50°C.
For example, the staining mixture may be maintained at a "relatively low" temperature, i.e., a temperature of about 4°C to about 30°C; in this embodiment, the temperature is preferably from about 20°C to about 30°C, more preferably from about 25°C to about 30°C, and most preferable at about 28°C. Alternatively, the staining mixture may be maintained within an "intermediate" temperature range, i.e., a temperature of about 30°C to about 39°C; in this embodiment, the temperature is preferably at about 34°C to about 39°C, and more preferably about 37°C. In addition, the staining mixture may be maintained within a "relatively high" temperature range, i.e., a temperature of about 40°C
to about 50°C; in this embodiment, the temperature is preferably from about 41°C to about 49°C, more preferably from about 41°C to about 45°C, still more preferably from about 41°C to about 43°C, and most preferably at about 41°C. Selection of a preferred temperature generally depends upon a range of variables, including for example, the permeability of the cells to the dyes) being used, the concentration of the dyes) in the staining mixture, the amount of time the cells will be maintained in the staining mixture, and the degree of enrichment desired in the sorting or enrichment step.
[0053] Uptake of dye by the sperm cells in the staining mixture is allowed to continue for a period of time sufficient to obtain the desired degree of DNA
staining. That period is typically a period sufficient for the dye to bind to the DNA of the sperm cells such that X
and Y chromosome-bearing sperm cells may be sorted or enriched based upon the differing and measurable fluorescence intensity between the two. Generally, this will be no more than about 24 hours; preferably no more than about 10 hours, more preferably, no more than about 2 hours, still more preferably no more than about 90 minutes, even more preferably no more than about 60 minutes, and most preferably from about 5 minutes to about 60 minutes.
In a particular embodiment, the period is about 30 minutes.
[0054] The length of the staining period and the temperature at which staining occurs are related such that 5 the longer the period of staining, the lower the temperature of staining temperature may be. For example, in one embodiment, the staining may occur at a "relatively low" temperature and for a period of about 3 hours to about 24 hours. Alternatively, the staining may occur at an 10 "intermediate" temperature and for a period of about one-half hour to about 3 hours. In addition, staining may occur at a "relatively high" temperature and for a period of about 10 minutes to about 90 minutes. In a particular embodiment, staining may occur at a temperature of about 15 4°C for a period of about 24 hours. In another embodiment, staining may occur at a temperature of about 18°C for a period of about 4 hours. In yet another embodiment, staining may occur at a temperature of about 41°C for a period of about 30 minutes.
20 [0055] Accordingly, in one embodiment, a staining mixture is formed comprising sperm cells, a motility inhibitor, and a dye in a concentration from about 100~M to about 450~,M, and the staining mixture is held for a period of time at a temperature of about 41°C. In another 25 embodiment, the period of time is about 30 minutes. In another embodiment, the motility inhibitor comprises 0.2048 NaHC03, 0.4338 KHC03, and 0.4738 C6H80~~H20 per 25mL
of purified water (0.097 moles/L of NaHC03, 0.173 moles/L of KHC03, 0 . 090 moles/L C6H80~ ~ H20 in water) .
[0056] In still another embodiment, a staining mixture is formed comprising sperm cells, a motility inhibitor, and a dye in a concentration from about 100~,M to about 450~.M, and the staining mixture is held for a period of time at a temperature of about 28°C. In another embodiment, the period of time is about 3 hours. In another embodiment, the motility inhibitor comprises 0.2048 NaHC03, 0.4338 KHC03, and 0.4738 C6H80~~Hz0 per 25mL of purified water (0.097 moles/L of NaHC03, 0.173 moles/L of KHC03, 0 . 090 moles/L C6H80~ ~ Hz0 in water) .
(ii) Sorting or Enriching of the Stained Cells [0057] A motility inhibitor may also be used to render the sperm cells immotile during sorting of the sperm cells.
Generally, once the sperm are stained according to the present invention, they may be sorted according to any known means that allows for separation based upon fluorescence. Commonly used and well known methods include flow cytometry systems, as exemplified by and described in U.S. Patent Nos. 5,135,759, 5,985,216, 6,071,689, 6,149,867, and 6,263,745, International Patent Publications WO 99/33956 and VJO 01/37655, and U.S. Patent Application Serial No.lO/812,351 (corresponding International Patent Publication WO 2004/088283), the content of each of which is hereby incorporated herein by reference. When sorting according to such methods, the sperm are introduced into the nozzle of a flow cytometer in a sample fluid. In one embodiment, therefore, the sample fluid may comprise the stained sperm cells and a motility inhibitor.
[0058] Likewise, the sheath fluid used to surround the stream of sample fluid as it travels through the cytometer may also comprise a motility inhibitor. Generally, the sheath fluid may be introduced into a nozzle of the cytometer using pressurized gas or by a syringe pump.
Preferably, the pressurized gas is carbon dioxide or nitrogen, more preferably carbon dioxide. Alternatively, the pressurized gas may be nitrogen.
[0059] Optionally, the sample fluid or sheath fluid may also contain additive, such as, an antibiotic, a composition which regulates oxidation/reduction reactions intracellularly or extracellularly, or a growth factor as discussed above with respect to cell sample collection Each of these additives may be added to either fluid in accordance therewith.
[0060] Alternatively, the cells of a sperm dispersion may be sorted or enriched using laser steering. This is often referred to as optical trapping or holographic optical trapping. Generally, tightly focused laser light, such as, for example, light focused by a microscope lens, will have a steep intensity gradient. Optical traps use the gradient forces of a beam of light to trap particles based upon the dielectric constant of the beam. To minimize its energy, a particle having a dielectric constant greater than the surrounding medium will move to a region of an optical trap where the electric field is highest. Such devices and methods are described, for example, in WO 2004/012133, U.S. Patent No. 6,416,190 and related applications and patents, the content of each of which is hereby incorporated herein by reference.
Immotility of sperm cells being sorted or enriched according to these methods allows for ease of alignment of cells in the stream and of the laser steering of these cells, thereby enabling a more efficient and accurate sorting or enrichment of the desired cells.
[0061] The cells of the sperm dispersion may be sorted accordingly into separate populations, wherein the spermatozoa of the populations comprises a certain percent X chromosome bearing or Y chromosome bearing sperm cells.

For example, the spermatozoa of one of the populations may comprise at least about 65% X chromosome bearing or Y
chromosome bearing sperm cells, at least about 70% X
chromosome bearing or Y chromosome bearing sperm cells, at least about 75% X chromosome bearing or Y chromosome bearing sperm cells, at least about 80% X chromosome bearing or Y chromosome bearing sperm cells, at least about 85% X chromosome bearing or Y chromosome bearing sperm cells, at least about 90% X chromosome bearing or Y
chromosome bearing sperm cells, or even at least about 95%
X chromosome bearing or Y chromosome bearing sperm cells.
~l.l.l ) Collection of the Sorted Cells [0062] Once sorted, the sorted cells are collected in a vessel that contains a collection fluid. Generally, the purpose of the collection fluid includes providing a fluid support for the cells.
[0063] In one embodiment, the collection fluid comprises a motility inhibitor. Optionally, the collection fluid may also comprise sterols, lipids, fatty acids, or a protein source. If included in the collection fluid, the sterols, lipids, and fatty acids may be, for example, cholesterol.
[0064] If included in the collection fluid, the protein source may be any protein source that does not interfere with the viability of the sperm cells and is compatible with the motility inhibitor. Examples of common protein sources include milk (including heat homogenized and skim), milk extract, egg yolk, egg yolk extract, soy protein and soy protein extract. Such proteins may be used in a concentration from about 1% (v/v) to about 30% (v/v), preferably from about 10% (v/v) to about 20% (v/v), and more preferably about 10% (v/v).

[0065] Optionally, the collection fluid may also contain additives such as, an antibiotic, a growth factor or a composition which regulates oxidation/reduction reactions intracellularly or extracellularly as discussed above with respect to cell sample collection. Each of these additives may be added to the collection fluid in accordance therewith.
[0066] Accordingly, in a certain embodiment, the collection fluid comprises 0.097 moles/L of NaHC03, 0 . 173 moles/L of KHC03, 0 . 090 moles/L C6Ha0~ ~ Hz0 and 10% (v/v) egg yolk in water, at a pH of about 6.2, more preferably of about 7.0, and even more preferably of about 6.5. Preferably, the collection fluid is maintained under an atmosphere having an enriched partial pressure of carbon dioxide relative to air; for example, the atmosphere may have a partial pressure of carbon dioxide in excess of 0.9, more preferably 0.95 and still more preferably 0.99.
[0067] In lieu of the use of a more traditional collection fluid, the sorted cells may be collected into a vessel containing or coated with a cryoextender.
Accordingly, in one particular embodiment, the sorted cells are collected into a cryoextender comprising a motility inhibitor. In another embodiment, the sorted cells are collected into a cryoextender comprising a motility inhibitor, water, Triladyl~ (Minitube, Verona, WI, comprising 60m1 glycerol, 24.28 tris, 13.88 citric acid, lO.Og fructose per liter, 5mg/100m1 tylosin, 25mg/100m1 gentamycin, 30mg/100m1 Spectinomycin, and l5mg/100m1 Lincomycin), egg yolk, and, optionally, pyruvic acid. In yet another embodiment, the collection fluid is the cryoextender comprising 0.097 moles/L of NaHC03, 0 . 173 moles/L of KHC03, 0 . 090 moles/L C6H80~ ~ HZO in water, and 25g Triladyl~, 25g egg yolk, and lOmM pyruvic acid per 75mL of water. In still another embodiment, the collection fluid is the cryoextender comprising 0.097 moles/L of NaHC03, 0.173 moles/L of KHC03, 0.090 moles/L C6H80~'H20 in water, and 25g Triladyl~, 25g egg yolk, per 75mL of water.
5 (iv) Cryoextension of the Sorted Cells [0068] Once the sperm have been sorted and collected into collection vessels, they may be used for inseminating female mammals. This can occur almost immediately, requiring little additional treatment of the sperm. In 10 such an instance, the sperm may be stored in their current state for a period of time necessary to, for example, transport the sperm to the location where the insemination is to take place. The sperm may, therefore, be stored and transported in, for example, the collection fluid.
15 Likewise, the sperm may be concentrated to a density appropriate for the particular mammalian species, for example, a density of about of about 50 x 106 sperm/ml to about 120 x 106 sperm/ml, in a motility inhibitor and subsequently stored and transported. The selected density 20 depends upon factors such as those discussed below with respect to fertilization, including the species of mammal from which the cells were obtained. Such a range of densities based upon the species of mammal from which the sperm were obtained are well known to those of skill in the 25 art. In any event, the sperm may remain immotile during the storage or transport period, as described in greater detail below.
[0069] Likewise, the sperm may also be cooled or frozen for use at a later date. In such instances, the 30 sperm may benefit from the addition of a cryoextender to minimize the impact upon viability or post-thaw motility as a result of cooling or freezing.

[0070] A motility inhibitor may be used to render cells in the cryoextender immotile. Generally, a cryoextender may comprise a motility inhibitor, a protein source, and a cryoprotectant. If included, a protein source may be added to provide support to the cells. The protein source may be any protein source that does not interfere with the viability of the sperm cells and is compatible with the motility inhibitor. Examples of common protein sources include milk (including heat homogenized and skim), milk extract, egg yolk, egg yolk extract, soy protein and soy protein extract. Such proteins may be found in a concentration from about 10% (v/v) to about 30% (v/v), preferably from about 10% (v/v) to about 20% (v/v), and more preferably about 20% (v/v).
[0071] A cryoprotectant is preferably included in the cryoextender to lessen or prevent cold shock or to maintain fertility of the sperm. Numerous cryoprotectants are known in the art. Selection of a cryoprotectant suitable for use with a given extender may vary, and depends upon the species from which the sperm to be frozen were obtained.
Examples of suitable cryoprotectants include, for example, glycerol, dimethyl sulfoxide, ethylene glycol, propylene glycol, trehalose, Triladyl~, and combinations thereof. If included, generally, these cryoprotectants are present in the cryoextender in an amount of about 1% (v/v) to about 15% (v/v), preferably in an amount of about 5% (v/v) to about 10% (v/v), more preferably in an amount of about 7% (v/v), and most preferably in an amount of about 6% (v/v) .
[0072] In one particular embodiment, the cryoextender comprises a motility inhibitor, water, Triladyl~, egg yolk, and, optionally, pyruvic acid. In yet another embodiment, the cryoextender comprises 0.097 moles/L of NaHC03,
32 0.173 moles/L of KHC03, 0.090 moles/L C6H80~~Hz0 in water, and 25g Triladyl~, 25g egg yolk, and lOmM pyruvic acid per 75mL of water.
[0073] In another particular embodiment, the cryoextender comprises a motility inhibitor, water, Triladyl~, and egg yolk. In yet another embodiment, the cryoextender comprises 0.097 moles/L of NaHC03, 0.173 moles/L of KHC03, 0.090 moles/L C6H$O~~H20 in water, and 25g Triladyl~, and 25g egg yolk per 75mL of water (0074] Optionally, the cryoextender may also contain an antibiotic, a growth factor, or a composition which regulates oxidation/reduction reactions intracellularly and/or extracellularly as discussed above with respect to cell sample collection Each of these additives may be added to the cryoextender in accordance therewith.
II. Storage of the Collected Cells A. Storage Period [0075] Once the cells have been collected from the source mammal, regardless of whether they are optionally sorted thereafter, the cells may be stored for a period of time. The period of storage is dependent upon several factors, including for example, the temperature at which the cells are stored, the number of cells within the storage container, whether the cells are sorted or unsorted, the method of fertilization for which the cells will be used, and the female mammal being fertilized.
Generally, for example, the cells may be stored for several hours, such as for example, 2, 4, 8, 12, or 24 hours; for several days, such as for example 1, 2, 3, 4, 5, 6, or 7 days; several weeks, such as for example, 1, 2, 3, or 4 weeks; or several months, such as for example, 1, 2, or 3 months. Typically, cells may be stored for several hours
33 to several days at a temperature of about 5°C to about 30°C; for several days to several weeks at a temperature of about -4°C to about 5°C; and for several weeks to several months at a temperature of about -196°C (in liquid nitrogen vapor) to about -4°C.
B. Storage Temperature [0076] The cells may be stored at a range of different temperatures. Selection of a storage temperature is dependent upon several factors, such as for example, the length of time for which the cells will be stored, the concentration of cells within the storage container, whether the cells are sorted or unsorted, the method of fertilization for which the cells will be used, and the female mammal being fertilized. All of these factors affect the number of cells that will remain viable during the storage period. By way of example, generally the greater the length of time for which the cells may be stored, the lower the temperature at which the cells may be stored. The decrease in temperature generally permits a greater percentage of the stored cells to remain viable over a longer period of time.
[0077] Accordingly, cells may be stored at a temperature of about -196°C to about 30°C. For example, cells may be stored at a "relatively low storage temperature," i.e., a temperature range of about -196°C to about -4°C; in this embodiment, the temperature is preferably from about -12°C to about -4°C, more preferably from about -10°C to about -4°C, and most preferable at about -4°C. Alternatively, the cells may be stored at an "intermediate storage temperature," i.e., a temperature range of about -4°C to about 5°C; in this embodiment, the temperature is preferably at about -3°C to about 5°C, and
34 more preferably about 0°C to about 5°C, and most preferably at about 5°C. In addition, the cells may be stored at a "moderately high storage temperature," i.e., a temperature range of about 5°C to about 30°C; in this embodiment, the temperature is preferably from about 10°C to about 25°C, more preferably from about 12°C to about 23°C, and still more preferably from about 15°C to about 20°C, and most preferably at about 18°C. Advantageously, it has been determined that storage of the cells at 18°C in the inhibitory buffer provides the added advantage of increased numbers of viable and motile sperm cells, as the rigors of storage at either a higher temperature or at a freezing temperature (i.e., temperature below 0°C ) may be detrimental to sperm viability.
C. Storage Container [0078] The sperm dispersion may be stored in a range of different containers. While the containers may vary in size, generally suitable containers will be capable of containing the sperm dispersion; that is to say, the containers will be constructed of a material that is not susceptible to leaking or deterioration as a result of contact with fluids generally, and sperm dispersions specifically, regardless of whether such contact occurs on the inside or outside of the container. Examples of suitable containers include, for example, flasks, beakers, test tubes, ampules, and other such containers that are generally constructed of glass, plastic, or other similar materials. In a particular embodiment, the container is of a type of construction that is used in the insemination of a female mammal, such as for example, an elongated container. Such elongated containers may generally have a length to diameter ratio of about 1000:1 to about 100:1, preferably a length to diameter ratio of about 900:1 to about 200:1, more preferably a length to diameter ratio of about 800:1 to about 300:1, still more preferably a length to diameter ratio of about 700:1 to about 400:1, even more 5 preferably a length to diameter ratio of about 600:1 to about 400:1, still more preferably a length to diameter ratio of about 500:1 to about 400:1, and in one particular embodiment, a length to diameter ratio of about 450:1.
Such elongated containers may generally have a volume of 10 about O.lcc to about 100cc, the volume of the container selected to be used being based upon the species of mammal from which the semen was collected. For example, the volume of such elongated containers may be from about O.lcc to about 0.7cc, preferably a volume of about 0.2cc to about 15 0.6cc, more preferably a volume of about 0.23cc to about 0.5cc, and most preferably a volume of about 0.3cc to about 0.4cc. In a particular embodiment, the elongated container is what is commonly referred to in the artificial insemination industry as a straw, having a volume of about 20 0.23cc and a length to diameter ratio of about 133:1. In another particular embodiment, the elongated container is what is commonly referred to in the artificial insemination industry as a straw, having a volume of about 0.5cc and a length to diameter ratio of about 67:1. Typically, 25 containers of these volumes are used for the storage of bovine sperm cells.
[0079] Alternatively, the volume of the elongated containers may be from about lcc to about 100cc, preferably a volume of about lOcc to about 75cc, more preferably a 30 volume of about l5cc to about 50cc, still more preferably a volume of about 20cc, to about 40cc, and even more preferably a volume of about 25cc to about 30cc. In a particular embodiment, the elongated container is what is commonly referred to in the artificial insemination industry as a straw, having a volume of about 25cc and a length to diameter ratio of about 445:1. Typically, containers of this volume are used for the storage of porcine sperm cells.
[0080] The advantage of storing the sperm dispersion in a straw is that the dispersion may remain stored therein until it is to be used for insemination of a female mammal, at which time the contents of the straw may be placed into the uterus of a female mammal. Accordingly, in such an instance, the cells may be maintained in the straw in a motility inhibitor, and therefore, in an immotile state, until the female is inseminated with the dispersion, at which time the in utero fluids will dilute the motility inhibitor, causing the immotile cells to become motile.
III. Fertilization or Insemination [0081] Another aspect of the present invention is the fertilization of an egg or insemination of a female mammal, generally employing the novel process for storing spermatozoa as described above.
[0082] Once a sperm dispersion has been formed as discussed in greater detail above with respect to the collection of a sperm cell sample, the sperm dispersion may be used to inseminate a female mammal. Insemination may be performed according to any of a number of methods well known to those of skill in the art. These methods include, for example, artificial insemination, including standard artificial insemination and deep uterine insemination, and other methods well known to those of skill in the art. For example, a sperm dispersion comprising immotile spermatozoa and a composition that induces sperm immotility, may be used to inseminate a female mammal, such as for example, by artificial insemination. In a particular embodiment, the sperm dispersion may be in an elongated container for use in the insemination of a female mammal, and the spermatozoa in the sperm dispersion may remain immotile until the insemination of the female mammal with the dispersion. In another embodiment, the spermatozoa in the sperm suspension are returned to a mobile or active state, such as, for example, by methods described above, and subsequently used to inseminate a female mammal.
[0083] Alternatively, the sperm dispersion may be used to fertilize an egg, and more particularly, an egg in vitro, such as for example, by microinjection, including intracytoplasmic sperm injection (ICSI), and other methods well known to those in the art. The fertilized egg may thereafter be introduced into the uterus of a female mammal by any of a number of means well known to those of skill in the art, such as for example embryo transplant.
[0084] Insemination of a female mammal or fertilization of an egg in vitro (followed by introduction of the fertilized egg into the uterus of a female) using a sperm dispersion may occur shortly after formation of the sperm dispersion, such as for example, within about 120 hours, preferably within about 96 hours, more preferably within about 72 hours, still more preferably within about 48 hours, and in a particular embodiment, within about 24 hours after formation of the sperm dispersion. In such instances, generally the dispersions may not have been cryopreserved prior to insemination of a female mammal or fertilization of an egg in vitro (i.e., the dispersion is fresh or comprises fresh sperm cells); instead it may have been maintained in a motility inhibitor and/or may have been refrigerated at temperatures of about 4°C to about 25°C, more preferably from about 10°C to about 25°C, still more preferably from about 15°C to about 20°C, and most preferably at about 18°C. Alternatively, the dispersion may be cryopreserved and then thawed prior to insemination of a female mammal or fertilization of an egg in vitro (i.e., the dispersion is frozen/thawed or comprises frozen/thawed sperm cells). Typically, in such an instance, the cryopreserved dispersion will be thawed immediately, such as, for example, within about 15 minutes, before insemination of a female mammal or fertilization of an egg in vitro. Alternatively, the cryopreserved dispersion may be thawed over a period of time or thawed and subsequently stored for a period of time, such as for example less than about 5 days, more preferably less than about 2 days, still more preferably less than about 1 day, and most preferably, less than about 12 hours.
IV. Process for Providing a Fresh Sperm Dispersion [0085] Another aspect of the present invention is providing a fresh sperm dispersion for fertilizing a female mammal generally employing the sperm dispersions described above. Advantageously, the motility inhibitor allows for the collection of spermatozoa from a source mammal into the same, and shipment of the sperm dispersion to the breeding location (i.e., the site at which the female mammal is to be inseminated) without the need to freeze the dispersion.
This, therefore, allows for a greater percentage of the sperm in the dispersion to remain viable versus a frozen/thawed dispersion, wherein the rigors of freezing and subsequently thawing the cells in the dispersion increases the risk of detrimentally affecting the viability of the cells. The use of a motility inhibitor in the sperm dispersion, and optionally the storage and/or the transport of the dispersion at a temperature of about 4°C to about 25°C, preferably at about 10°C to about 20°C , more preferably at about 15°C to about 20°C, and most preferably at about 18°C, permits higher fertility rates in female mammals fertilized with the sperm dispersions. The use of a motility inhibitor in the sperm dispersion, and optionally low temperature storage and transport, also permits for the use of a lower sperm concentrations to fertilize female mammals, as a greater number of cells in the dispersion maintain viability.
Once the sperm dispersion is formed as described in greater detail above with respect to sample collection, the dispersion may be placed in a container for shipment to a remote location, such as a farm or other breeding location, which may be, for example, one or more miles (1.69 or more kilometers) away from the location at which the spermatozoa were obtained or the sperm dispersion was formed. The dispersion may be placed in any container that will protect the dispersion from damage as a result of the rigors of shipment. The container may be insulated in order to maintain the dispersion at a suitable temperature, such as for example between about 4°C to about 25°C, more preferably from about 10°C to about 25°C, still more preferably from about 15°C to about 20°C, and most preferably at about 18°C. Moreover, the dispersion may be placed in a container for use in insemination of a female mammal, and then one or more of the insemination containers placed in a container for shipment to the remote location.
By way of example, the sperm dispersion may be placed in one or more straws, and the straws then placed in a cooler for shipment to the breeding location.

[0086] The container may be shipped by any of the many well known means of shipping items, such as for example, by U.S. mail, by any of a number of overnight shipment services, or by courier service.
5 [0087] Having described the invention in detail, it will be apparent that modifications and variations are possible without departing the scope of the invention defined in the appended claims.

Claims (5)

WHAT IS CLAIMED IS:
1. A process for storing unsorted spermatozoa, the process comprising a. forming a sperm dispersion, the sperm dispersion comprising spermatozoa, a composition that induces sperm immotility, and an antibiotic, and b. storing the sperm dispersion.
2. A process for storing sorted spermatozoa, the process comprising a. forming a sperm dispersion, the sperm dispersion comprising spermatozoa and a composition that induces sperm immotility, b. sorting the sperm dispersion into separate populations, wherein the spermatozoa of one of the populations comprises at least about 65% X chromosome bearing sperm cells or at least about 65% Y chromosome bearing sperm cells, and c. storing the one population at a temperature of about -4°C to about 30°C.
3. A process for inseminating a female mammal, the process comprising inseminating a female mammal with a sperm dispersion, the sperm dispersion comprising immotile spermatozoa and a composition that induces sperm immotility.
4. A process for providing a fresh sperm dispersion for inseminating a female mammal, the process comprising:

a. forming a sperm dispersion, the sperm dispersion comprising spermatozoa and a composition that induces sperm immotility, b. placing the sperm dispersion in a container for shipment to a remote location, and c. shipping the sperm dispersion in the container to a remote location within about 24 hours after forming the sperm dispersion.

5. A combination comprising:

a. an elongated container for use in the insemination of a female mammal, and b. a sperm dispersion, the sperm dispersion comprising immotile spermatozoa and a composition that induces sperm immotility, and wherein the sperm dispersion is contained in the elongated container.

6. A sperm dispersion comprising immotile spermatozoa, a composition that induces sperm immotility, and a cryopreservative.

7. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored at about -4°C to about 30°C

8. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored at about -4°C to about 5°C.

9. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored at about -4°C to about 0°C.

10. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored at about 0°C to about 5°C.

11. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored at about 5°C to about 30°C.

12. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 24 hours.

13. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 48 hours.

14. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 72 hours.

15. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 96 hours.

16. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 1 week.

17. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 2 weeks.

18. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 0.04 × 10 6 sperm/ml.

19. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 1.5 ×
6 sperm/ml.

20. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 2 ×
10 6 sperm/ml.

2l.The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 3 ×
10 6 sperm/ml.

22. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 0.5 ×
10 7 sperm/ml.

23. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 1 ×
10 7 sperm/ml.

24. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 2 ×
10 7 sperm/ml.

25. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 3 ×
7 sperm/ml.

26. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 4 ×
10 7 sperm/ml.

27. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 5 ×
10 7 sperm/ml.

28. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 6 ×
10 7 sperm/ml.

29. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 7 ×
10 7 sperm/ml.

30. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 8 ×
10 7 sperm/ml.

31. The process, combination, or dispersion of any one of the preceding claims, wherein the concentration of spermatozoa in the sperm dispersion is at least about 12 ×
10 7 sperm/ml.

32. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 1:1, respectively.

33. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 1.25:1.

34. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 1.5:1.

35. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 1.75:1.

36. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 2:1.

37. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 3:1.

38. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 4:1.

39. The process, combination, or dispersion of any one of the preceding claims, wherein the composition that induces sperm immotility comprises potassium and optionally sodium, the molar ratio of potassium to sodium being greater than 5:1.

40. The process, combination, or dispersion of any one of the preceding claims, wherein the spermatozoa in the sperm dispersion have a motility more characteristic of epididymal spermatozoa than endogenous ejaculated spermatozoa of the same species.

41. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion comprises a source of carbonate.

42. The process, combination, or dispersion of any one of the preceding claims, wherein the dispersion comprises NaHCO3 , KHCO3, and C6H8O7, H2O.

43. The process, combination, or dispersion of any one of the preceding claims, wherein the dispersion comprises a buffer comprising 0.097 moles/L of NaHCO3, 0.173 moles/L of KHCO3, 0.090 moles/L C6H8O7 H2O in water.

44. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion further comprises a cryopreservative.
45. The process, combination, or dispersion of claim 44, wherein the cryopreservative comprises glycerol.
46. The process, combination, or dispersion of claim 44 or 45, wherein the cryopreservative comprises egg yolk.
47. The process, combination, or dispersion of any one of claims 44, 45, or 46 wherein the cryopreservative comprises glycerol, TRIS, citric acid, and fructose.
48. The process, combination, or dispersion of any one of claims 44, 45, 46, or 47 wherein the cryopreservative comprises 60m1 glycerol, 24.2g TRIS, 13.8g citric acid, 10.0g fructose per liter of cryopreservative.
49. The process, combination, or dispersion of any one of the preceding claims, wherein the spermatozoa in the sperm dispersion is from more than one mammal of the same species.
50. The process, combination, or dispersion of any one of the preceding claims, wherein the spermatozoa in the sperm dispersion is from a mammal selected from the group consisting of bovine, porcine, equine, or swine.
51. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 70% X chromosome bearing or at least about 70% Y chromosome bearing sperm cells.
52. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 75% X chromosome bearing or at least about 75% Y chromosome bearing sperm cells.
53. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 80% X chromosome bearing or at least about 80% Y chromosome bearing sperm cells.
54. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 85% X chromosome bearing or at least about 85% Y chromosome bearing sperm cells.
55. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 90% X chromosome bearing or at least about 90% Y chromosome bearing sperm cells.
56. The process of claim 2 or any claim dependent upon claim 2, wherein the spermatozoa of one of the populations comprises at least about 95% X chromosome bearing or at least about 95% Y chromosome bearing sperm cells.
57. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 65% X

chromosome bearing sperm cells or at least about 65% Y
chromosome bearing sperm cells.
58. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 70% X
chromosome bearing sperm cells or at least about 70% Y
chromosome bearing sperm cells.
59. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 75% X
chromosome bearing sperm cells or at least about 75% Y
chromosome bearing sperm cells.
60. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 80% X
chromosome bearing sperm cells or at least about 80% Y
chromosome bearing sperm cells.
61. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 85% X

chromosome bearing sperm cells or at least about 85% Y
chromosome bearing sperm cells.
62. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 90% X
chromosome bearing sperm cells or at least about 90% Y
chromosome bearing sperm cells.
63. The process of claim 3 or 4, or the combination of claim 5, or any claim dependent upon claims 3, 4, or 5, wherein the sperm dispersion comprises spermatozoa sorted into separate populations, wherein the spermatozoa of one of the populations comprises at least about 95% X
chromosome bearing sperm cells or at least about 95% Y
chromosome bearing sperm cells.
64. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is frozen.
65. The process, combination, or dispersion of any one of claims 1-63, wherein the sperm dispersion is not frozen.
66. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 24 hours prior to insemination of a female mammal with the sperm dispersion.
67. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 48 hours prior to insemination of a female mammal with the sperm dispersion.
68. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 72 hours prior to insemination of a female mammal with the sperm dispersion.
69. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 96 hours prior to insemination of a female mammal with the sperm dispersion.
70. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is stored for at least about 120 hours prior to insemination of a female mammal with the sperm dispersion.
71. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is shipped within about 24 hours after the formation of the sperm dispersion.
72. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is shipped within about 48 hours after the formation of the sperm dispersion.
73. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is shipped within about 72 hours after the formation of the sperm dispersion.

74. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is shipped within about 96 hours after the formation of the sperm dispersion.
75. The process, combination, or dispersion of any one of the preceding claims, wherein the sperm dispersion is shipped within about 120 hours after the formation of the sperm dispersion.
76. The combination of claim 5 or any claim dependent upon
claim 5, wherein the container is an artificial insemination straw.
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