THE EFFECT OF PROSTAGLANDIN F2α DURING VARIOUS STAGES OF THE OESTROUS CYCLE OF BEEF HEIFERS
THE EFFECT OF PROSTAGLANDIN F2α DURING VARIOUS STAGES OF THE OESTROUS CYCLE OF BEEF HEIFERS
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前列腺素F2α对肉牛发情周期各阶段的影响
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
J. F. Dickey
中科院分区：
文献类型：
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作者：
D. Henricks;J. T. Long;J. Hill;J. F. Dickey
研究了前列腺素对30头肉牛外周血黄体酮和雌激素水平、发情周期改变发生率及生育力的影响。在发情周期的三个时期：第3至5天，第9和第10天，第16和第17天，通过将人工受精移液管插入子宫腔给予PGF2g=。除第3、4天处理的动物外，其余动物均在2 ~ 5天内发情。血浆孕酮水平在治疗后一天显著下降，并在那些返回发情的小母牛中继续下降。随着黄体酮的下降，血浆雌激素在发情前一天或发情当天达到峰值。在接近发情期和交配后的16天内，激素模式与未治疗的动物非常相似。治疗组母牛的妊娠率明显低于未治疗组母牛。这可能是由于子宫感染，而不是药物本身。
The effects of prostaglandin F2g=aon peripheral plasma progesterone and oestrogen levels, incidence of oestrous cycle alteration, and fertility were examined in thirty beef heifers. The PGF2g=awas administered by insertion of an insemination pipette into the lumen of the uterus during three periods of the oestrous cycle: Days 3 to 5, Days 9 and 10, and Days 16 and 17. Oestrus occurred within 2 to 5 days in all animals treated except those treated on Days 3 and 4. Plasma progesterone levels had fallen significantly by the day following treatment and continued to fall in those heifers returning to oestrus. As progesterone fell, plasma oestrogen increased to a peak level on the day before or the day of oestrus. The hormone patterns were quite similar to those of the untreated animals as they approached oestrus and during the 16-day period after mating. The pregnancy rate was significantly lower in the treated heifers than in the untreated heifers. This was probably due to uterine infections rather than to the drug per se.