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• W2016348742 abstract "Gonadotrophin-releasing hormone (GnRH) readily stimulated LH output by sheep pituitary cells in vitro, and raised plasma LH concentrations in vivo in sheep, in a dose-dependent fashion. However, increases in FSH levels were only marginal by comparison. Dose-dependent decreases in sheep pituitary cell FSH output and in plasma FSH concentrations were caused by sheep follicular fluid and oestradiol-17 beta in vitro, and by bovine follicular fluid and oestradiol benzoate in vivo. In contrast, LH concentrations were only reduced slightly at the higher doses of these reagents. Cumulative suppressive effects of follicular fluid and oestradiol-17 beta (oestradiol benzoate) on FSH levels were observed both in vitro and in vivo. The transient positive feedback effect of oestradiol benzoate on FSH output negated the suppressive effect of bovine follicular fluid on plasma FSH concentrations. Progestagens, androgens and catechol oestrogens also suppressed mean FSH output in vitro, though not as effectively as oestradiol-17 beta. While only 1-5 pg/ml of oestradiol-17 beta was needed to suppress significantly mean FSH output in vitro, greater than 500 pg/ml of the other steroids was required. Seminal plasma inhibin-like peptide failed to suppress mean FSH output by cultured sheep pituitary cells at doses from 1 pg/ml to 500 ng/ml. At higher doses, both FSH and LH output was suppressed and this was accompanied by morphological deterioration of the cells. It is suggested that, to raise plasma FSH concentrations with a view to increasing ovulation rates in sheep, the development of means to reduce the negative feedback effects of steroids, notably oestradiol-17 beta, and inhibin on FSH secretion may be a more appropriate pharmacological strategy than increasing pituitary exposure to GnRH." @default.
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• W2016348742 date "1989-05-01" @default.
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• W2016348742 title "Studies of the effectiveness of gonadotrophin-releasing hormone, steroids and follicular fluid in modulating ovine gonadotrophin output in vivo and in vitro" @default.
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• W2016348742 doi "https://doi.org/10.1530/jrf.0.0860105" @default.
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