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Diencephalic regulation of plasma LH, ovulation, and sexual behavior in the rat.

Female rats which displayed a regular pattern of four-day estrous cycles were used to study the effects of surgical cuts placed at the posterior border of the optic chiasm on mating, ovulation, and plasma LH concentration. Two additional groups of four-day cycling females served as mated and unmated controls, autopsied on a morning of estrus. It was found that interruption of fibers in the anterior region of the basomedial hypothalamus results in constant behavioral receptivity maintained over several weeks of testing. Mating did not induce ovulation; however, females with the cut at the chiasmatic border were capable of ovulating in response to exogenous LH treatment 38-40 days after surgical treatment. Ovarian histology suggested that the largest (atretic) follicles did not ovulate, but that a developing cohort of follicles ovulated to exogenous LH. Plasma LH was significantly elevated at the time of autopsy in the operated animals in contrast to the controls. Uterine weights suggest that endogenous est...