Abstract
AbstractFemale hamsters maintained in groups of 4 to 12 animals continue to show four‐day ovulatory cycles. However, when placed with males on the evening of proestrus, only 40% of these grouped females mate. Ninety‐five per cent of females caged singly or in groups of two, mate in less than ten minutes when placed with males on the evening of proestrus. Thus, grouping of female hamsters blocks reproduction in some individuals through a behavioral mechanism which does not apparently affect the ovulatory cycle. Receptivity cannot be reinitiated in such animals by administration of exogenous progesterone on the afternoon of proestrus.
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