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Mouse and hamster spermatozoa from the cauda epididymidis were deposited into the female tract at various periods following ligation of the corpus epididymidis. It was found that the number of spermatozoa in the cauda epididymidis decreased sooner in the hamster than in the mouse but the initial decrease in fertilizing ability occurred much earlier in the mouse than in the hamster. The fertilizing life of spermatozoa in the cauda epididymidis is approximately 25 days in both species.

THE FERTILIZING LIFE OF SPERMATOZOA IN THE CAUDA EPIDIDYMIDIS OF MICE AND HAMSTERS