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In the rabbit, daily sperm production by the testes was estimated by determining the total number of spermatozoa and late spermatids contained in a testicular suspension, and the length of the spermatogenic cycle was estimated by an autoradiographic technique. In twenty bucks, 9 to 14 months old (mean weight 3\m=.\9kg), which had spent 6\m=.\9\m=+-\1\m=.\8weeks in a constant photoperiod of 14 hr light daily, the

GONADAL AND EPIDIDYMAL SPERM RESERVES IN THE RABBIT: ESTIMATION OF THE DAILY SPERM PRODUCTION