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Study on the Retained Fetal Membranes in Dairy Cattle
Author(s): 
Pages: 21-22
Year: Issue:  2
Journal: HEILONGJIANG JOURNAL OF ANIMAL SCIENCE AND VETERINARY MEDICNE

Keyword:  胎衣不下奶牛发病率;
Abstract: 通过对牡丹江市三道畜牧场1994~1997年1 021头次分娩母牛的配种、产房及兽医记录的统计、分析,调查结果表明该场四年来,年平均胎衣不下发病率为20.86%;夏秋(5~10月)产犊的胎衣不下发病率略高于冬春季(11~4月)。经产母牛的胎衣不下发病率极显著高于初产母牛。从第六胎起胎衣不下发病率明显增高,产双胎时胎衣不下发病率极显著高于产单胎的母牛,单产的胎衣不下发病率显著高于足月分娩母牛,单产死胎的胎衣不下发病率最高。产死胎时胎衣不下发病率显著高于产活犊的母牛。上胎胎衣不下的母牛再次分娩时的胎衣不下发病率,显著高于上胎胎衣自落的母牛。在原床位或运动场上分娩时胎衣不下发病率亦显著高于产房分娩的母牛。
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