The duration of the luteal phase and the ‘proestrus’ phase in three species of lemurs (Lemur macaco, Lemur catta, and Lemur variegatus) was determined by serum progesterone measurement. Total immunoreactive estrogens were measured and remained below 0.20 ng/ml except for an apparent peak of short duration during estrus. Circulating testosterone levels in males confirm previously described seasonal gonadal function. The reproductive cycle of the female lemur is discussed and compared to the cycles of estrous and menstrual animals.

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