1) Feeding of pregnant sows: From the perspective of promoting fetal development, the feeding amount during pregnancy should be reduced and the weight gain during pregnancy should be controlled at 30-40 kg; Improve the nutritional level during lactation. Feed more green roughage (green feed, silage, dregs, etc.). ) feed more concentrate in the early pregnancy, but in the late pregnancy to improve the nutritional level. The specific formula of concentrate is: corn 45%, wheat 14%, beans 5%, wheat bran 10%, fish meal10.5%, bone meal 2%, grass meal 13%, cottonseed cake 8% and auxin/kloc. The diet should contain 1 1.7 MJ, 12% crude protein, 0.6% calcium and 0.5% phosphorus per kilogram. This diet is fed 1.3 kg per day in the first trimester and 2.5-3 kg in the second trimester. The feeding amount can be flexibly controlled according to the weight and climatic conditions of sows, so that they are neither too thin nor too fat. For multiparous sows with poor constitution, nutrition should be strengthened after breeding because of their high consumption during lactation. This stage lasts about 20-30 days. Besides feeding high-quality green roughage, we should also feed some concentrate. After that, maintain a moderate level of nutrition until the third month of pregnancy, and then appropriately strengthen nutrition and increase concentrate. (2) Management of pregnant sows: It is best for pregnant sows to graze 1-2 hours a day, or to move freely in large sports venues for 2-3 hours, so as to strengthen the system, enable them to give birth smoothly and reduce stillbirth. It is necessary to prevent sows from mechanical abortion due to pushing and biting. High temperature (32-39℃) in the early pregnancy, especially in the first week, is easy to cause death, and the heat resistance is enhanced after 3 weeks. In summer, we should take measures to prevent heatstroke and cool down, and don't feed moldy and toxic feed. In addition, we should be prepared before labor. There are two methods to calculate the expected date of delivery: one is the "3, 3, 3 method", that is, the breeding day plus 3 months, 3 weeks and 3 days; The second is the "April minus six method", that is, the breeding day is added by four months, and minus six days is the expected date of delivery. (3) Nursing of sows in labor: Before delivery 1 week, clean the pen, spread grass on the pen, keep it dry, and disinfect the surrounding environment. Commonly used disinfectants are 20%-30% plant ash Leachate, 10%-20% lime milk, 1%-3% caustic soda water, 2%-5% Lysol water, etc. When the sow has symptoms such as fidgeting, labor pains, vaginal mucus discharge, etc. They should prepare delivery equipment. Delivery should be guarded by a special person. If dystocia occurs, you can inject oxytocin, massage the sow's breast by hand or apply it with a hot towel, which is beneficial to fetal exclusion. After delivery, clean the fence and replace the clean and sanitary mat. Pay attention to the exclusion of fetal membranes and help piglets eat colostrum.