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- W2069758959 abstract "Effects of estradiol on serum luteinizing hormone (LH) were studied in prepubertal boars. In Exp. 1, 15-wk-old boars were given (iv) 50 mug estradiol, 1 mg testosterone or 1.5 ml ethanol. Estradiol (P<0.05) decreased LH over a 2.5-hr period, but testosterone did not. In Exp. 2, an estradiol implant reduced LH sample variance (P<0.01) while LH (547 +/- 96 vs 655 +/- 43 pg/ml) and estradiol (14.2 +/- 3.3 vs 18.4 +/- 1.0 pg/ml; control vs implant) were unchanged in 12-wk-old boars. Pulsatile LH releases (4.3 +/- 1.1 vs 3.0 +/- 0.4 pulses/pig/8 hr; control vs treated) and pulse amplitude (272 +/- 34 vs 305 +/- 40 pg/ml) were not affected. The implant tended to decrease serum testosterone (4.86 +/- 0.75 vs 7.66 +/- 1.51 ng/ml; P<0.10). In Exp. 3, LH was higher after zero implants than after four implants (279 +/- 7 vs 227 +/- 9 pg/ml; P<0.01), and LH after two implants was also higher than after four implants (263 +/- 7 pg/ml; P<0.01) in 14-wk-old boars in a Latin square design. Peak LH after 40 mug gonadotropin releasing hormone (GnRH) was less after two and four implants (1,100 +/- 126 and 960 +/- 167 pg/ml, respectively; P<0.01) than after zero implants (1,742 +/- 126 pg/ml). Slope of the first 20 min of LH response to GnRH was greater after zero implants (45.3 pg/min; P<0.05) than after either two or four implants (20.6 and 16.9 pg/min, respectively). Implant treatment decreased serum testosterone (P<0.025) but increased estradiol (P<0.10). Small changes in serum estradiol resulted in changes in LH. These changes in sample variance and mean LH were recognized by boars as different from normal because serum testosterone decreased. Changes in LH may result from estradiol's negative effect on pituitary responsiveness to endogenous GnRH because response to exogenous GnRH was depressed by estradiol." @default.
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- W2069758959 date "1984-02-01" @default.
- W2069758959 modified "2023-09-27" @default.
- W2069758959 title "Relationship between serum luteinizing hormone and estradiol in prepubertal boars" @default.
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- W2069758959 doi "https://doi.org/10.1016/0093-691x(84)90416-3" @default.
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