First, weaning is irrational. Farmers raise their pigs to take a weaning method and go on the market immediately after weaning. This changes suddenly the living conditions of the piglets, and it is difficult to adjust to the increase in weight. The number of suckling pigs should be gradually reduced from 5 days to 6 days before weaning until they are fully weaned. This method is very beneficial to the growth of piglets. Second, feed is not timely. The piglets did not feed in time during the lactation period and they did not eat well after weaning, causing slow growth and poor growth. Piglets should be fed at 7 days of age so that when the sow's lactation levels drop, they can be officially supplemented to make up for the lack of breast milk. It started with fragrant, sweet, brittle and easily digestible feeds, and gradually changed to normal feed later. Third, feed and feeding methods are unreasonable. After weaning, piglets are not only unable to feed on breast milk, but also feed quality is poor. Feeding water is more than expected, and the number of daily feedings is sharply reduced from 6-8 times before weaning to 3 times daily, and these changes make the piglets normal. Development is hampered. Therefore, when you purchase pigs, you need to ask in detail about the feeding and management of the pigs so that the fine, green, and rough feeds will gradually transition and the number of feeds will gradually change from more to fewer. Fourth, changes in environmental conditions are too great. After weaning piglets, usually a pig lap, can not adapt to this lonely life for a short time, especially in winter, the cold weather, coupled with poor eating can not sleep well, it is easy to produce a variety of diseases, and even death. Therefore, when buying pigs, try to ask as many questions as possible to create a comfortable living environment for the piglets. Fifth, extensive management. At present, farmer pigs are generally a pigsty, and life is monotonous. Some pigs eat, sleep and defecate in the same place. In addition, cleaning and washers are not used, resulting in environmental pollution and poor sanitation conditions. This can easily cause diseases and severely affect pigs. Only healthy. In actual pig production, pigs can compete for food and fast growth, and they can adjust their diets according to the speed of eating and eating, and the quality of the pigs is 3 to 6 heads. Urine, sleep on a regular basis, and keep the environment clean. Six, epidemic prevention, to pad the wrong time. Farmers buy more pigs in the bazaar, and they are also carrying out epidemic prevention and castration at the time of purchase. In this way, weaning, epidemic prevention, and castration were all added to the piglets to make them lose weight over a long period of time, which seriously affected the normal development of the pigs. At the age of 20 days, the gilts can be castrated from 30 days to 40 days. In order to prevent swine fever, a piglet vaccine may be given after the birth of the piglet and before the baby is sucked. The erysipelas vaccine can be injected after weaning.