Abstract
Summary
1) Progesterone and its metabolite Δ4-3-ketopregnene-20 a-ol are present in the ovarian vein blood of estrous rabbits without functional corpora lutea. 2) After mating or administration of a gonadotropin which induces ovulation, the output of these steroids is immediately elevated. 3) Gonadotropins, but not lactogenic hormone (LGH), also activate progestin release from the ovary containing functional corpora lutea of pregnancy or pseudopregnancy.
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