Ovulation in immature rats induced by daily subcutaneous administration of sheep follicle-stimulating hormone (FSH) was prevented by appropriately timed injection of phenobarbitone or by exposure to continuous light. Progesterone produced ovulation in light-blocked rats and in rats kept in standard lighting which had received a non-ovulatory dose of FSH.
These findings are interpreted to mean that ovulation produced by these preparations of FSH was due to a release of ovulating hormone from the pituitary gland. It is suggested that slight luteinizing hormone activity in an FSH preparation produces ovulation by causing the secretion of progesterone which then facilitates the release of ovulating hormone from the pituitary gland.
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