Abstract
Pituitary FSH concentrations during the sexual cycle were measured in rats. The highest values were found in the morning of the day of proestrus. Between the morning (9 am) and the afternoon (5 pm) of this day, a Sharp decline in pituitary FSH concentration occurred. Thereafter the values increased until the next proestrus. The drop in pituitary FSH concentration could be prevented by administration of atropine or pentobarbital prior to the critical period. Ovariectomy performed before 9 am of the day of proestrus also blocked the drop in pituitary FSH. Progesterone but not estradiol injected after ovariectomy restored the normal situation. It is concluded that a neurogenic mechanism probably triggered by progesterone is involved in the drop in pituitary FSH which takes place between the morning and the afternoon on the day of proestrus. (Endocrinology 81: 1261, 1967)
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