There are many causes of abortion in dairy cows, including genetics, climate and environment, endocrinology, diseases, and feeding and management. The improper feeding and management are the main incentives. For example, feed fed with spoilage can cause cow poisoning, resulting in miscarriage; sudden changes in temperature (such as climate change, cold stimulation, etc.), mechanical compression, cows suffering from stress, injury, etc., but also Cow abortion. Immunosuppression, casting magnets, and the heavy maintenance of hooves in the late spring and early summer, as well as incomplete artificial insemination and sterilization, or the technique is not too hard (such as check the tire movements, miscarriage of pregnant cattle, etc.), can lead to abortion. Prevention of pregnant cattle abortion should take the following technical measures. 1. Introduce quarantine to prevent and control abortion-producing tuberculosis, salmonellosis, and brucellosis; prevent the introduction of livestock from the affected area to the herds that have not been affected; if it must be introduced, it should be introduced from a disease-free area. Quarantine and rearing under isolation conditions, and determine the absence of disease before mixing. Second, to strengthen management to strengthen the herd and the environment cleaning, disinfection work, usually pay attention to the health of cattle, serious brushing, in particular, to maintain the abdomen health of pregnant cows to prevent the occurrence of vaginitis, metritis; regular quarantine, vaccination, drive Insects and disinfection; and as far as possible control the temperature of the barn environment, in particular, do a good job of cooling the sun. Third, a reasonable sports exercise should be set up when the playground (the stadium is located in the front or rear of the cowshed, the area of ​​6-8 square meters per cow design) to ensure that the cow has sufficient light and exercise, but pregnant cattle in pregnancy The amount of exercise in the later period cannot be too large. The floor of the barn should be non-slip to prevent the pregnant cow from being squeezed or bumped. It is not possible to whip the pregnant cow and prevent it from being frightened. IV. Feeding Drinking Water Pregnant cows should be given rich in nutrient-rich and comprehensive high-quality feeds such as vitamin A, vitamin B2, minerals, and trace elements to prevent the fetus from dying halfway through nutritional deficiencies or nutritional imbalances, so as to ensure the normality of early embryos. Developmental needs. Can not drastically change the feed type, feed formulation and feeding management methods, do not feed frost grass, mildew, frozen and spoilage feed, and potato, cottonseed cake and other toxin containing feed. To provide adequate clean drinking water, pregnant cattle sweat, do not drink cold water on an empty stomach.