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To examine the importance of tonic LH secretion in ovarian follicular development, plasma concentrations of LH were lowered by administering antiserum to GnRH (GnRH AS). At 1100 h on metestrus or diestrus of the 4-day estrous cycle, rats were injected with GnRH AS, and blood samples were collected at 6 h intervals until 1100 h on the next metestrus. Separately, rats were injected with hCG after the administration of GnRH AS to examine the effect of lowered LH on the number of ovulatory follicles. Treatment with GnRH AS on either metestrus or diestrus lowered plasma concentrations of LH, inhibin, and estradiol. In contrast, the plasma concentrations of FSH increased after the GnRH AS treatment, probably due to a decrease in plasma levels of inhibin associated with suppression of ovarian follicular development. Administration of GnRH AS on metestrus noticeably reduced the number of ovulatory follicles in spite of the high FSH secretion. Such a reduction in the number of ovulatory follicles was blocked by replacing rat LH with ovine LH. These data indicate that tonic secretion of LH plays an important role in the regulation of follicular development during the estrous cycle of the rat.

Inhibition of Ovarian Follicular Development Associated with a Decrease in Luteinizing Hormone Levels During the Estrous Cycle of the Rat.