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The gilts do not have estrus and repeated empathy: There are many reasons why gilts are not estrus. In addition to abnormalities in breeds and physiology, they are also subject to artificial management, seasons, nutrition, cysts, pseudopregnancy, etc. Some infectious diseases are also With these symptoms, to solve these problems, we must analyze specific issues and take appropriate measures. 1, congenital genital dysplasia or deformity should be eliminated in time. 2. Nutritional deficiency should increase protein, vitamins, minerals and other nutrients in the diet and strengthen exercise. 3, for fatten sows should lose weight, reduce or add roughage, feed more green feed. Add 3% calcium chloride in the feed and feed it for a few days. 4. Sows injected with chorionic gonadotropin 500-1000 units or maternal serum 200-1000 units and used male boar sympathy, can also use their synthetic PG600 better. 5. Ensure that the gilts have 4 hours of daylight or artificial lighting for 16-18 hours per day. 6, so that non-estrus sows more exposure to estrus sows. 7. Change the pigsty and increase stimulation. 8. Ensure that gilts are not in contact with boars for 15 minutes per day and change boars frequently. 9. Check if zearalenone is excessive in feed to avoid false pregnancy. There are many factors that cause regrowth, and there are regular registrants and irregular registrants according to time of return. The reasons for regular regurgitation are abnormal physiological structure, seasonal infertility, cysts, operation during artificial insemination and quality problems of semen, excessive use of boars at the time of crossing, no use for a long time, or lack of fertility and breeding of boars. Errors occurred in the program; irregular returning was caused by fever of any cause, infectious disease, environmental temperature, trauma and fighting, seasonal effects, and excessive feeding after mating. The important role of “estrus management†in gilts The current annual replenishment volume of gilts on many large-scale farms has risen to almost 40% of the group size. This, together with the gilt rearing, has many differences from the gilts. The special requirements of pigs, if the production managers do not pay enough attention and do not adopt a systematic and targeted feeding management program, will make the entire pig farm production face great challenges. The following is a discussion of the important role played in gilt management from the aspect of “estrus managementâ€: 1. The gilt exceeds the weight and is not estrus at the age of months. Generally for the external dual sow, the first estrus should occur around the age of about 6 months and about 100kg in weight. 2. The proportion of dystocia in gilts is high. For midwifery sows, the midwifery will have a great deal of damage, which often leads directly to the emergence of endometritis and habitual dystocia. 3, gilts weaning can not enter the estrus cycle. This is also a common problem. After years of research at home and abroad, the main factor is the nutritional problems of the newly born sows. 4. Because there is no record of gilts' estrus, gilts have no time basis for the “aphrodisiac supplementation†prescribed in the 2 weeks before the gilts are bred, which results in the full potential of the gilts' litter size. 5, gilts are more prone to limb and hoof problems than sows. The reasons for the above problems are summarized as that the farm production management personnel do not have a deep understanding of the physical growth and development of the gilts, including the reproductive system, and the special nutrition and feeding needs of the gestational breast-feeding production. Sow rearing and management measures.