1982
DOI: 10.2527/jas1982.554901x
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Effect of Estradiol on Hypothalamic GnRH and Pituitary and Serum LH and FSH in Ovariectomized Pigs

Abstract: Two experiments were conducted to measure pituitary gonadotropins, hypothalamic-gonadotropin releasing hormone (GnRH) and pituitary response to GnRH during periods when serum luteinizing hormone (LH) was suppressed by estradiol-17 beta (e2) in ovariectomized pigs. In the first experiment, 10 ovariectomized gilts were assigned to two groups of five each according to time of slaughter (24 or 36 h after injection). Within each group, gilts were given corn oil (n = 2) or 400 micrograms E2 (n = 3). Neither serum no… Show more

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Cited by 27 publications
(15 citation statements)
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“…Our data confirm the report that pituitary responsiveness to GnRH was inhibited in the pig for only 12-20 h Endo • 1987 Vol 121 • No 5 after E 2 administration (18). The brevity of this action contrasts with the 36-52 h during which serum LH concentrations were suppressed in gilts given E 2 alone.…”
Section: Discussionsupporting
confidence: 93%
See 2 more Smart Citations
“…Our data confirm the report that pituitary responsiveness to GnRH was inhibited in the pig for only 12-20 h Endo • 1987 Vol 121 • No 5 after E 2 administration (18). The brevity of this action contrasts with the 36-52 h during which serum LH concentrations were suppressed in gilts given E 2 alone.…”
Section: Discussionsupporting
confidence: 93%
“…One is that the LH surge is the sequel to a surge of GnRH release, as has been documented for the rat (11). Alternatively, the prolonged period during which LH release is suppressed by E 2 may be a necessary antecedent to the surge, leading, for instance, to accumulation of releasable hormone in the pituitary (18), and thereby providing a hyperresponsive target for GnRH when secretion of this neuropeptide resumes. Invoking such a mechanism could help explain why, when GnRH pulses were given continually after E 2 B, no LH surges were observed in AIMAX-E 2 B-treated gilts and sensitization of the pituitary by E 2 was not apparent.…”
Section: Discussionmentioning
confidence: 95%
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“…First, gonadotrope re sponsiveness to Gn RH is reduced for approximately 12-24 h [6,16], Based on the data presented herein, this suppression is clearly not a sequel to actions upon the brain, i.e. secretion of release-inhibiting factors.…”
Section: Discussionmentioning
confidence: 99%
“…Perhaps GnRH expo sure is required for deactivation of this estrogenic mechanism. In addition, E2 acts in the pig to increase pituitary stores of LH within 36 h [6], Whether this is a direct action of the steroid or secondary to inhibited GnRH secretion is not known.…”
Section: Discussionmentioning
confidence: 99%