Acute effects of unilateral ovariectomy on follicular development in the cyclic hamster

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Abstract
Hamsters were hemispayed at 09:00 h on day 3 of the cycle (day 1 = ovulation) and were killed 1 h after injection of [3H]thymidine at 09:00, 12:00, 17:00 or 22:00 h. Unilateral ovariectomy had no effect on the number of stage 1 or stage 2 follicles, but there were significantly fewer stage 3 follicles between 10:00 and 13:00 h. This decrease was not encountered in intact hamsters and was reflected in an increase in the number of stage 6 (antral) follicles. At 13:00 h there was no difference in number of atretic follicles between the experimental and control groups. Preantral follicles with 6-7 layers of granulosa cells apparently were recruited within 4 h after unilateral ovariectomy and transformed into antral follicles.

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