奶牛发情期的奶孕酮分析 |
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引用本文: | 李复东,彭世媛,张家藻,刘汉才.奶牛发情期的奶孕酮分析[J].中国畜牧杂志,1986(4). |
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作者姓名: | 李复东 彭世媛 张家藻 刘汉才 |
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作者单位: | 四川大学生物系
(李复东,张家藻),四川财经学院农技教研室
(彭世媛),成都市神仙树乳牛场(刘汉才) |
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摘 要: | <正> 影响奶牛人工授精成功率的主要原因是对发情期能否正确判断,适时输精。据1981年联邦德国Bavarian动物健康服务机构的报告,输精时间不正确,是影响奶牛繁殖率的重要因素。由于孕酮含量在发情周期中呈规律性变化,在发情期显著下降,因此可
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RADIO-IMMUNOASSAY OF MILK PROGESTERONE DURING OESTRUS IN DAIRY COWS |
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Abstract: | During estrus, the progesterone levels in milk of 48 cows were < 2 ng/ ml in 36 cows (75%), 2.3-5.0 ng/ml in 8 cows (16.75%), >7 ng/ml in 4 cows (8.3%). 5 cows (10.4%) had pseudoestrus and their milk progesterone continuously maintained high levels. In cows with normal oe-strous cycles, oestrus appeared 1-2 days after the progesterone level had declined to basal value. The milk progesterone levels were at the basal value far about 6 days around oestrus and then increased gradually. On the day of insemination, the mean milk progesterone level was 1.86 + /-1.84 ng/ml (n= 8 ) in pregnant cows and 1.25+/-0.92 ng/ml (n = 11) in non-pregnant cows. The difference was not significant (P>0.05) . |
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