Abstract
Summary
Ovarian follicles in the laying hen were found to exhibit a differential rate of atresia following hypophysectomy which is dependent on follicle size. Atresia appeared first in the smallest of the rapidly developing follicles at 6 hours post-operatively and spread to include all mature or nearly mature follicles by 18 hours. Follicles weighing 5 to 10 g remained intact for as long as 24 hours.
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