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。
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.
乳业农场主达谢敏告诉法国电视台，他饲养的乳牛无法找到足够的草地放牧。
Dairy farmer Alain Duchemain told French TV his cows are having a hard time finding enough grass for grazing.
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