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• W2121006212 abstract "Abstract Secretion of luteinizing hormone (LH) and effects of estradiol were evaluated during and after the prepubertal decline in negative feedback of estradiol on secretion of LH. Prepubertal heifers (269 ± 4 days of age; n=10) were ovariectomized on February 6, 1981 (Day 0). Five ovariectomized heifers were administered a subcutaneous implant on Day 0 which provided physiological serum concentrations of estradiol (OVX-E 2 ). The remaining 5 heifers were not implanted (OVX). A second estradiol implant was administered to OVX-E 2 heifers on Day 164 (n=3) or Day 206 (n=2) of the study. Blood samples were collected sequentially (every 12 min for 8 hr) at approximately two week intervals from Days 0 to 232 of the experiment. The experimental period spanned from approximately 100 days before (269 days of age) to 100 days after (501 days of age) the expected age at puberty. Mean serum concentration of LH and frequency of LH pulses increased rapidly from Days 0 to 36 in OVX heifers and were followed by a further gradual rise in pulse frequency (Day 50 to 232) and a reciprocal decline in mean LH and pulse amplitude. The rapid post-ovariectomy increase in secretion of LH was blocked by estradiol in OVX-E 2 heifers. All characteristics (mean, frequency and amplitude) of secretion of LH increased gradually during the experimental period in OVX-E 2 heifers (Days 0 to 232). Mean concentration and amplitude of pulses were higher in OVX-E 2 than in OVX heifers by Days 148 and 134, respectively. These differences were maintained for the remainder of the experimental period. No acute effects of the second estradiol implant on secretion of LH were observed in OVX-E 2 heifers. Results of this study indicate that long-term changes in secretion of LH occur following prepubertal ovariectomy in heifers and suggest that the previously documented prepubertal decline in negative feedback of estradiol on secretion of LH is followed by a period of positive feedback after pubertal age is surpassed." @default.
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• W2121006212 date "1986-01-01" @default.
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• W2121006212 title "Influence of prepubertal ovariectomy and estradiol replacement therapy on secretion of luteinizing hormone before and after pubertal age in heifers" @default.
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• W2121006212 doi "https://doi.org/10.1016/0739-7240(86)90036-6" @default.
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