Management factors In daily management, it is strictly forbidden to mix estrus cows with pregnant cows, and it is strictly forbidden to violently whip, quickly drive or let pregnant cows cross ditches and hurdles to prevent cows from aborting due to mutual climbing or excessive exercise. The practice of empty pregnancy factor proves that the longer the cows are empty pregnant, the higher the probability of miscarriage. We should pay attention to control the fatness of empty cows in production, so that the fatness of empty cows is moderate. At the same time, it is necessary to increase the exercise of empty cows and feed more green and juicy feed to prevent cows from being too fat or too thin to cause infertility and abortion. Environmental factors: the slope of the ground of the cowshed is too large, and there is too much water, which makes the cows slip and cause abortion. In the process of engineering construction, the slope of the milk shed ground should be less than 3 degrees, and the ground should be rough. Don't sprinkle water on the ground during feeding. Age factor The younger the first mating age of cattle, the higher the incidence of abortion. In production, the first mating age of young cattle should be controlled at 18 months old and the weight should be 380 ~ 400 kg. In addition, it is necessary to strengthen the management of pregnant cattle and provide full-price compound feed and enough green and juicy feed. Brucellosis is an infectious factor, which often causes large-scale epidemic of dairy cows. Therefore, brucellosis should be comprehensively monitored in spring and autumn every year, and the cattle with positive monitoring should be culled in time to purify the farm area. At the same time, strict monitoring and quarantine should be carried out when introducing cattle, and newly introduced cattle should be observed in isolation for 30 days before polyculture can be carried out without disease. Cattle suffering from uterine diseases due to disease factors are prone to miscarriage. Feeding management should be strengthened in production to promote the recovery of postpartum cows' uterus and prevent uterine diseases in time. Cattle that have miscarried more than twice in a row should be eliminated in time. Feeding factors: the abortion rate of dairy cows in 3 ~ 5 months of pregnancy is higher, and the abortion rate in the first 2 months of pregnancy is lower. Therefore, it is necessary to strengthen the management of pregnant cows in the early and middle stages, and it is strictly forbidden to feed inferior, moldy and deteriorated feed and frozen water. In short, in order to protect the fetus, we should first pay attention to the nutritional balance of cattle, and ensure the balance of vitamins, minerals and trace elements according to the nutritional needs of cattle. Second, it is necessary to strengthen veterinary health supervision and regularly disinfect and prevent diseases in the cattle farm environment. As long as the imported cattle are strictly quarantined, cows with any diseases are not allowed to enter. The ultraviolet disinfection time for personnel entering the production area shall not be less than 8 minutes. Vehicles entering the production area must be strictly disinfected, and the production area shall be disinfected once a week as far as possible. Third, we should pay attention to the systematic management of cattle farms and reduce the pressure on cattle. Strengthen the management of cattle farms and try to get all kinds of information about aborted cattle. Any cow's abortion begins with a cow. Correct analysis can prevent the occurrence of cow abortion, reduce the probability of cow abortion and improve the efficiency of raising cattle.