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Biology of Reproduction, Vol 13, 99-103, Copyright © 1975 by Society for the Study of Reproduction
1 Department of Psychology, University of California, Berkeley, California 94720 Intact female hamsters were housed in a 14:10 LD cycle. During the winter, starvation for one
estrous cycle blocked ovulation in 6/8 animals. Fifty percent normal food intake for one cycle did
not block ovulation, but may have reduced the number of ova shed. Similar treatment for two
cycles blocked ovulation in 6/9 animals. Pinealectomy failed to prevent starvation-induced
anovulation. Among dark or LD housed animals starved during the summer, estrous cycles were
not disrupted. These animals and an unstarved summer control group appeared to have shed more
ova and had heavier uteri than winter controls. A seasonal influence upon susceptibility to
starvation is suggested.
Accepted on April 9, 1975
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