The structure of placenta and unsuitable raising management often lead to retention of the afterbirth which it brings to the greatest loss of the reproduction of cow industry.
牛属于子叶型胎盘，这种胎盘的结构特点和饲养管理的不当，常常导致奶牛胎衣不下发生，给乳牛业的生产繁殖带来极大损失。
Retention of the afterbirth of the cow is the comm on disease to seriously affect the economy mileage.
文摘：奶牛的胎衣不下，是严重影响奶牛经济效益的常见病。
Retention of the afterbirth of the cow is the common disease to seriously affect the economy mileage.
奶牛的胎衣不下，是严重影响奶牛经济效益的常见病。
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