Results:The former needed less time, and complemented retention of placenta and fatal membranes, hypamnion of late pragracy, dead fetus, failure of induction developed in induction by rivanolum.
结果：米非司酮加米索前列醇引产时间短，且对雷凡诺引产中出现的胎盘胎膜滞留和晚期妊娠羊水少、死胎、引产失败等均具有较好的互补作用。
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。
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