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The effectiveness of the water test, short hypoosmotic swelling test with ultrapure water was examined in canine epididymal spermatozoa to evaluate tail membrane integrity. Spermatozoa during epididymal transit were also characterized. Sperm suspension obtained from cauda epididymis was diluted 1:4 with ultrapure water, and incubated for 5 min. The percentage of swollen spermatozoa in the water test was significantly correlated with both the sperm motility and the swelling value obtained by the conventional hypoosmotic swelling test. Canine spermatozoa collected from the caput epididymis were not motile, but revealed membrane integrity in a water test. The water test can be used as a simple and short hypoosmotic swelling test to evaluate the tail membrane integrity of canine epididymal spermatozoa.

Evaluation of Membrane Integrity of Canine Epididymal Spermatozoa by Short Hypoosmotic Swelling Test with Ultrapure Water