Sperm cell separation system

1. A method of modifying a sperm cell sample, comprising:

a) obtaining said sperm cell sample;

b) generating a fluid pressure;

c) adjusting said fluid pressure to a pressure capable of modifying at least one fertility characteristic of said sperm cell sample;

d) exposing said sperm cell sample of a) to said fluid pressure of c); and

e) collecting said sperm cell sample after said exposing d), said sperm cell sample having a controlled modification of said at least one fertility characteristic.

2. The method of claim 1 , wherein said adjusting said fluid pressure occurs in a range of about 20 psi (0.098 kg/cm 2 ) and about 100 psi (7.03 kg/cm 2 ).

3. The method as described in claim 2 , wherein said adjusting said fluid pressure occurs between about 30 psi (2.10 kg/cm 2 ) and about 40 psi (2.81 kg/cm 2 ).

4. The method as described in claim 3 , wherein said adjusting said fluid pressure of step c) further comprises incrementally adjusting said fluid pressure to modify said at least one fertility characteristic of said sperm cell sample.

5. The method as described in claim 4 , wherein said at least one fertility characteristic is selected from the group consisting of: sperm cell motility, sperm cell viability, oocyte cleavage rate, blastocyst formation rate, pregnancy rate, and a combination thereof.

6. The method as described in claim 3 , wherein said fluid pressure is selected from the group consisting of: about 30 psi when said at least one fertility characteristic comprises sperm cell motility; about 40 psi when said at least one fertility characteristic comprises sperm cell motility; about 30 psi when said at least one fertility characteristic comprises sperm cell viability; about 40 psi when said at least one fertility characteristic comprises sperm cell viability; about 40 psi when said at least one fertility characteristic comprises oocyte cleavage rate; about 40 psi when said at least one fertility characteristic comprises blastocyst formation rate; and about 40 psi when said at least one fertility characteristic comprises pregnancy rate.

7. The method of claim 1 , wherein said fluid pressure generates a fluid stream having a fluid stream pressure.

8. The method of claim 7 , further comprising generating said fluid stream within a conduit to provide said fluid stream pressure.

9. The method of claim 8 , further comprising surrounding said fluid stream with a sheath fluid stream.

10. The method of claim 9 , wherein said sheath fluid stream includes a sheath fluid selected from the group consisting of: a phosphate buffered saline (PBS), a citrate buffer, a 2.9% sodium citrate buffer, a HEPES buffer, a TRIS-based sheath fluid, and a combination thereof.

11. The method of claim 1 , further comprising analyzing said sperm cells to discriminate between X-chromosome bearing sperm cells and Y-chromosome bearing sperm cells.

12. The method of claim 11 , further comprising separating said X-chromosome bearing sperm cells from said Y-chromosome bearing sperm cells prior to said collecting.

13. A method of claim 12 , wherein said sperm cell sample is selected from the group consisting of: a bovine sperm cell sample, an equine sperm cell sample, an ovine sperm cell sample, a canine sperm cell sample, a feline sperm cell sample, a swine sperm cell sample, a marine mammal sperm cell sample, a deer sperm cell sample, a primate sperm cell sample, a goat sperm cell sample, and a combination thereof.

14. The method of claim 12 , further comprising isolating said X-chromosome bearing sperm cells or said Y-chromosome bearing sperm cells as sex selected sperm samples, and further comprising fertilizing oocytes with said sex selected sperm samples by in-vitro fertilization.