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xi you yu fang tai yi zhi liu zuo yong
Pages: 39
Year: Issue:  12
Journal: Heilongjiang Animal Science and Veterinary Medicine

Keyword:  胎衣滞留作用血硒水平遗传因子维生素预防畜群乳牛机械母牛;
Abstract: <正> 最新材料记载,如果成年乳牛的胎衣滞留不是机械的或遗传因子引起的,则可能系因硒和(或)维生素E缺乏所致。在有胎衣滞留问题畜群中的母牛血硒水平比没有此问题的畜群要低。在产前20天注
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