Spring is the peak period for the mating of cows. However, due to the unpredictable climate change, the incidence and mortality of cattle are extremely high. Therefore, it is necessary to strengthen feeding and management, scientifically fertilize the fetus, ensure the safety of the mother and child, and increase the reproduction rate. Empty breeding cows. Before the grazing date, the semi-saturated hay is fed to the cows and transferred to the whole day for grazing after 15 days to 20 days. Each day, each cow is fed with 50 grams of salt and 1 kg to 2 kg of mash mixed with barley, corn and soybeans. Before grazing, cattle are fed with water first and fed with grass. After the cattle eat five or sixty percent, they are fed mixed concentrate and then diluted with salt water. After the cows rest for 15 minutes to 20 minutes, they are allowed to graze and grazing. Nocturnal grass allows cattle to drink water and feed freely. Estrus cows are mated. After the estrus, the cows became excited and unceasingly screaming. The tail was high and the vagina was translucent with white translucent mucus. It can be drawn into 7 cm to 8 cm filaments by hand. Oestrus generally lasts 12 hours to 22 hours. Ovulation occurs 10 hours to 15 hours after the estrus is over. Therefore, the appropriate breeding time for cows is: 8:10 am on the day of estrus, and 7:00 am the next morning. The time is supplemented once; in the afternoon, the estrus is bred from 8am to 10am, and is supplemented once in the afternoon or evening. Induced oestrus ovulation. Normal cow genitalia but not estrus or missed estrus period, available maternal urine, diethylstilbestrol triadimefon, etrogylate diol and other induced cow estrus ovulation, timely mating abortion, to prevent empty. Carefully feeding pregnant cows. To ensure that the nutritional needs of the pregnant cow itself and the fetus are met, supply high-quality compound feed. The formula is corn 30%, bean cake 20%, rice 15%, cottonseed cake 15%, rapeseed cake 5%, rice bran 15%, moderate amount of bone meal and salt. 1 kilogram - 2 kilograms of concentrate per day, enough green feed and ammoniated feed. Feeding time, less to add ground, drinking warm water, sunny days choose leeward sunny place grazing, enhance cattle body movement. Prevention of miscarriage and child safety. In the middle of pregnancy, the cattle should gradually reduce the intensity of military service. It is forbidden to draw cold whip, perform emergency activities, turn sharp bends, and make heavy duty. One month before labor, stop working to prevent abortion. If the cow is pregnant, the vagina will flow out of the mucus, and constantly look back at the abdomen, and it will cause restlessness; late breast enlargement, oscillating urinary frequency posture, abdominal pain, fetal movement is stopped, it is abortion omen, to prompt treatment, available progesterone 0.5 g - One gram of intramuscular injection, once daily, for 4 days to 6 days. When the cow is mildly dystocia due to lack of exercise, 60-100 units of oxytocin or 10 mg-20 mg of diethylstilbestrol may be injected subcutaneously to induce better results. Strengthen the daily feeding environment management. The bar houses must be closed to cover the loopholes, and should be sheltered from the wind, not leaking from the rain, not damp, often changing the soil in addition to cow dung, diligently changing the matting ground, and regularly disinfecting with lime or ash. After the cow is released, the doors and windows in the column should be opened for ventilation. Brush the body of the skin daily to keep the skin clean and enhance disease resistance. To achieve a net forage, drinking water, drinking feed trough net, cattle net, cattle body net. Earloop Kn95 Face Mask,Kn95 Fold Flat Face Mask,Kn95 Filters Respirator,Kn95 Protective Face Mask Jiangmen anjian biotechnology co. LTD , https://www.jmanjianmask.com