Weaning is the biggest stress factor after the birth of piglets, because piglets no longer receive nutrition through breast milk. Piglets need an adaptation process (usually 1 week). This is what is commonly referred to as "weaning off." First, the production of interrupted piglets often appear problems 1, negative growth due to weaning stress, poor appetite, intake is not enough, weaned piglets within a few days after weaning, not only does not increase weight, but decreased. It usually takes 1 week for the piglets to regain weight. 2, diarrhea, diarrhea, tail tremors, ear cyanosis, row of green dung. Death necropsy showed systemic dehydration and the small intestine was full. 3. In the second week after the occurrence of scuba weaning, the incidence of piglets was 5-20%, and the mortality rate was 100%. The main lesions were edema and hemorrhage. The edema in the large curve of the stomach was the most significant, with a thickness of up to 4 cm. Body surface lymph nodes, mesenteric lymph nodes. Vascular congestion and cerebral effusion. Second, the cause of the disease 1, piglets physiological characteristics Gastrointestinal acid secretion and digestive tract secretion of piglets are less, 8 weeks after the secretion of more complete, before, piglets digest protein fat, carbohydrates and other nutrients function is poor. 2. Change in microbial flora The pH in the stomach after weaning increases, the number of lactic acid bacteria decreases, and the number of E. coli increases, which is prone to diseases. 3. The immune status of piglets The maternal antibody titer of piglets after 2-4 weeks of age is low, and the active immunity is not perfect, and it is easy to develop. 4, stress piglets after weaning, pens and management are deteriorating, large groups feeding, pig bite frame, affecting its growth and development. Third, the solution 1, supplementation before weaning (starting at 12 days of age) supplement feeding, can meet the nutritional needs of its growth and development, but also can reduce the post-weaning feeding conversion stress. (1) Reasonable choice of raw materials for the preparation of high-quality weaned piglet diets, skimmed milk powder, whey powdered lactose, spray-dried plasma powder, high-quality fish meal, puffed soybeans, etc. can be used to increase the growth rate and reduce diarrhea. (2) The use of acidifying agents such as citric acid, fumaric acid (fumaric acid) and propionic acid can significantly increase the daily gain and feed conversion rate of piglets. (3) Enzyme preparations The most successful enzyme preparation at present is phytase, which can increase the digestibility of feed and promote growth and development of piglets. 2. Management measures (1) When the mother does not move the weaned piglets after weaning, the sows are driven off and the piglets remain in the original circle, which can reduce the degree of stress. (2) She temperature should be suitable for just weaned piglets that are very sensitive to low temperatures. It has been reported that if the temperature difference exceeds 2°C in the first week after weaning, the piglets will have diarrhea and poor growth. (3) The ground should be dry and damp to increase the loss of body temperature. The pigs with insufficient calories are more likely to catch cold and lower body temperature. (4) Anti-thief wind research showed that piglets exposed to thieves' wind conditions had a 6% slower growth rate and a 16% increase in feed consumption.