In order to promote the normal breeding of dairy cows, farmers need to understand the reproductive physiology of dairy cows. In breeding, it is necessary to carry out scientific feeding and management of dairy cows to better ensure the mating of dairy cows. However, due to various unreasonable factors leading to the occurrence of abortions in some dairy cows, the abortion of dairy cows is a large degree of economic loss for farmers. This question mainly analyzes the causes of dairy cow abortion and provides effective prevention and control measures through the following aspects: 1. Management factors In daily management, estrus cows are not allowed to be polycultured with pregnant cows, and it is strictly forbidden to whip pregnant cows, drive them out quickly, or allow them to cross ridges, etc., to prevent cows from causing cross-overs or excessive movements. abortion. 2, empty factors Practice has proved that the longer the empty cows practice, the higher the probability of abortion. In the production of Chinese medicines, attention should be paid to controlling the feelings of empty cows, so that the cows are moderate in sensation, and at the same time increase the amount of empty cows' exercise and feed more green and juicy feed to prevent infertility and miscarriage when the cows are too fat or too thin. 3, environmental factors Dairy cowshed ground slope is too large, too much water, so that dairy cows slide to cause abortion. During the construction of the project, the ground slope of the dairy cows should be less than 3 degrees and the ground should be rough. During the breeding process, do not spray water on the ground at ordinary times. 4. Age factors The smaller the initial age of the cow, the higher the incidence of abortion. In production, the initial age of young cows should be controlled to be over 18 months old and weigh between 380 and 400 kilograms. In addition, it is necessary to strengthen the management of pregnant cows, provide full-priced compound feed and adequate green and juicy feed. 5. Infectious factors Brucellosis often causes large areas of dairy cows. Therefore, brucellosis is monitored every year in the spring and autumn, and the positive cows are culled and monitored in a timely manner to purify the farm area. At the same time, it is necessary to strictly monitor and quarantine the introduction of dairy cows. The newly introduced dairy cows will be observed for 30 days in isolation and can be polycultured when they are not sick. 6. Disease factors Dairy cows suffering from uterine diseases are prone to miscarriage. The production management should be strengthened to promote the recovery of the uterus of postpartum cows and to prevent and treat uterine diseases in time. Cows that have had more than two consecutive abortions should be phased out in time. 7. Feeding factors The milk abortion rate is higher for pregnant cows between 3 and 5 months of pregnancy, and the miscarriage rate is lower during the first 2 months of pregnancy. Therefore, we must effectively strengthen the management of pregnant cows in the early and mid-term, and it is forbidden to feed feeds and frozen water of poor quality, mildew and spoilage. In short, to prevent the abortion of dairy cows, one must pay attention to the nutritional balance of dairy cows, and according to the nutritional needs of dairy cows, ensure the balance of intake of vitamins, minerals, and trace elements. The second is to strengthen the veterinary health supervision and regular disinfection and disease prevention of the dairy farm environment. The introduction of exotic cows requires strict quarantine and does not allow cattle with any disease to enter. UV disinfection personnel entering the production area can not be less than 8 minutes. Vehicles entering the production area must be strictly disinfected, and the production area should be disinfected once a week. Third, we must pay attention to the systematic management of dairy farms and reduce the stress of dairy cows. Farmers need to strengthen the feeding and management of dairy cows, especially dairy cows during pregnancy, and seek to control the causes of abortion of dairy cows in a timely manner so as to prevent the outbreak of abortion of dairy cows, thereby reducing the chance of abortion of dairy cows and improving the breeding efficiency of dairy cows. Strengthen the management of dairy farms to obtain as much as possible information on the occurrence of aborted cows. Any abortion of cows begins with a single cow. Proper analysis can prevent the outbreak of abortion, reduce the chance of abortion and increase the efficiency of dairy farming. Food additives are compounds or natural substances added to food for the purpose of improving the color, aroma, and taste of food, as well as for the needs of anti-corrosion and processing technology. 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