Effects of Various Feeding Regimens and Photoperiod or Pinealectomy on Ovulation in the Hamster

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Abstract
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.

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