ウシの発情ならびに排卵前後における血中卵胞刺激ホルモンおよび黄体形成ホルモン濃度の変化

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  • Periferal plasma concentrations of FSH and LH around estrus and ovulation in the heifer.
  • ウシ ノ ハツジョウ ナラビニ ハイラン ゼンゴ ニ オケル ケッチュウ ラン

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The temporal relationship of the change in peripheral plasma level of gonadotropins to the onset of estrus and the occurrence of ovulation was studied in 3 cyclic Japanese Black heifers. Blood sam-ples were obtained from the juglar vein at intervals of 1 or 2 h for consective 4 to 5 days coveringthe period of estrus and ovulation. Follicle stimulating hormone (FSH) and luteinizing hormone (LH) concentrations were determined by the respective double antibody radioimmunoassay.<BR>Plasma FSH concentrations remained low before and after the estrus period. The FSH surge with the peak level of 318.4±29.6ng/ml (mean±SD) was observed concurrent with the LH surge 5.3±2.3h after the onset of estrus and the duration of the surge was 9.3±0.6h. Ovulation was detected 25.7±0.6h after the FSH peak or 31.0±2.6h after the onset of estrus.<BR>Besides the prominent FSH surge during the estrus period small but noticeable peaks were fre-quently observed in the plasma FSH concentration. The fluctuations of FSH before the onset of estrus tended to synchronize with those of LH. After the estrus period, however, LH stayed at a constantly low level irrespective of the changes in FSH.<BR>Thus, there is a possibility that FSH might be involved in the ovulatory process in the heifer and that the responsiveness of pituitary cells for FSH and LH to gonadotropin releasing hormone (GnRH) might be differently modified by ovarian steroids.

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