Abstract
This study was designed to determine the population of developing follicles ⩾ 0.04 mm in diameter (with one or more layers of cuboidal granulosa cells) at day 140 of pregnancy in four luteectomized ewes. Only one corpus luteum (CL) was present in the ovulating ovaries of each ewe. Following surgical removal of the CL at day 75 of pregnancy, no abortion occurred in any of the four ewes. No differences were found in the number of preantral or antral follicles between the ovary with a CL removed and the ovary bearing no CL. The pattern of preantral and antral follicular growth was similar in the two kinds of ovaries. However, there was evidence that early follicular development was enhanced after luteectomy. The results of the present study suggest that luteal factors other than progesterone play a key role in the regulation of folliculogenesis during pregnancy in ewes.
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