Pig pica is a stress syndrome caused by improper feeding and management, environmental discomfort, unbalanced feed nutrition, disease and metabolic dysfunction. Specific performance and clinical symptoms: performance is mainly biting tail, biting ears, biting ribs, sucking the navel, feces, drinking urine, arches, noisy circles, wall, jumping bars and other phenomena. Mutual fighting is a relatively unpleasant phenomenon. Pigs with different foods are uncomfortable, aggressive, fierce, and have increased activity. The feed intake is reduced and feed utilization rate is reduced. Etiology analysis and countermeasures: I. Feeding density Including breeding density is too large, feeding trough space is small, limited feeding and drinking water is insufficient, the size of the pigs in the same pen home is not the same, pigs can cause fighting due to new swarms, etc. Solution: Reasonable breeding density such as nursery pig 0.6---0.8 square meters/head; fattening stage 0.9--1.3 square meters/head, big and small pigs feeding only in separate circles, adding “Vibo†to feed or drinking water during the transition ", or placing toys, etc. to draw the attention of the pig. Second, environmental factors Reasons for high rates in summer and autumn. Poor environment conditions, such as too high or too low temperature inside the house, poor ventilation and accumulation of harmful gases, strong light in the pigsty, pigs are excited and irritability; abnormal changes in the weather, wet skin caused by sty Such factors as causing discomfort to the pig or poor rest can all lead to the occurrence of pica and other pica. Solution: Improve the environmental sanitation of the pens, make the pigs have a quiet and comfortable living environment, add cool curtain fans and other reasonable cooling in the summer hot season, add “cool summer (livestock special)†in the drinking water, and relieve the summer cooling Excited. Third, varieties and individual differences If pigs of different breeds or between the same breeds are overweight in the same pigsty, the breeds and life characteristics are different, and they are in conflict with one another, and they compete with one another to cause biting. The differences between individuals are large. In possession of sleeping areas and catching food, there is often a phenomenon of bullying. Solution: The best way is to control the individual difference within 3 kg, avoid bullying and eating. Diseases: Pigs suffer from ectoparasites such as lice and lice. Can cause pig skin irritation and irritability, friction in the house resulting in ear, ribs, etc., there is exudation, and other pigs have an attraction to induce tail biting; pig parasites, especially pig aphids, Stimulate pigs to attack other pigs. Solution: Do a good job in the deworming of the herd, one month after the gilt buy back, the insects are repelled once, then like the sows, the insects are dewormed four times a year; the growing pigs are one month after the reinsurance and before the slaughter One month each deworming time. V. Unbalanced Nutrition Supply When feed nutrient levels are lower than the feed standards and cannot meet the nutritional needs of pig growth and development, biting tail can occur. In addition, various trace nutrients in the diet are imbalanced, such as the deficiency or imbalance of potassium, sodium, magnesium, iron, calcium, phosphorus, and vitamins in the diet. All kinds of emergency situations will lead to a corresponding deployment of the endocrine system of the pig. Solution: According to the nutritional needs of the pig's diet, various nutrients can be reasonably added to meet the nutritional needs of the pig. In short, according to the overall situation of the pigs, to make reasonable judgments, symptomatic treatment to minimize the damage to the pica and to ensure the healthy growth of the pig is our goal.