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Changes in inhibin activity, and progesterone, oestrogen and androstenedione concentrations, in rat follicular fluid throughout the oestrous cycle

Summary. Follicular fluid was aspirated from all visible surface follicles of rats at selected times of the oestrous cycle. Fluids from a pair of rat ovaries were pooled and assayed for inhibin activity by the rat anterior pituitary cell culture assay. Serum LH, FSH and progesterone as well as follicular fluid progesterone, total oestrogens and androstenedione were also measured. Follicular fluid inhibin activity was relatively constant throughout the oestrous cycle (30·7 ± 3·4% inhibition of FSH per 0·1 µl follicular fluid) except for a well defined surge at pro-oestrus (09:00–16:00 h, peak at 14:00 h = 84·0 ± 7·2% inhibition of FSH per 0·1 µl follicular fluid). The follicular fluid was not treated with charcoal before assay because a pilot experiment showed that such treatment did not alter the inhibin activity of follicular fluid. Steroids in follicular fluid were generally lowest on the afternoon of oestrus and the morning of dioestrus I and generally elevated during pro-oestrus.

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