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Ligation of the distal corpus epididymidis and ductus deferens for 20 days resulted in low fertilizing ability of spermatozoa isolated in the cauda epididymidis of intact hamsters and castrated animals treated daily with 100 \g=m\gtestosterone. Following ligation of the ductuli efferentes and vasectomy in intact hamsters, however, new spermatozoa accumulated in the cauda epididymidis and fertilizing ability was maintained at the control level after 20 days. In the testosterone-treated castrated hamsters, the resulting fertilizing ability was dose-dependent: spermatozoa continued to migrate through the epididymis after twenty daily injections of either 12\m=.\5or 100 \g=m\gtestosterone but developed fertilizing ability only after treatment with the higher dose of testosterone. The results show that circulating testosterone is important for sperm maturation in the hamster.

THE EFFECT OF CASTRATION AND TESTOSTERONE REPLACEMENT ON SPERM MATURATION IN THE HAMSTER