The reason and countermeasures of sows not having estrus after childbirth

One reason is that the gilt's initial age is too early. In the sows that have just entered puberty, although reproductive organs have normal reproductive functions, premature breeding can result in fewer births, smaller piglets, and lower weaning survival rates, affecting the sow’s own development, and having significantly less weight than the same age sow. Postpartum estrus is significantly postponed or prolonged without heat. Second, improper feeding and management. (-) Under normal circumstances, the sow undergoes a lactation period, and the body weight is reduced to varying degrees (20-40 kg), which does not affect the postpartum normal estrus. However, in sows with many tapes, large amounts of lactation, and large weight loss (weight loss of more than 50 kilograms), and lack of dietary nutrients, they often have postpartum estrus or delayed estrus. (2) The number of sows born is small, and sows are fed a large amount of high-energy, high-protein feeds, so that a large amount of fat deposits in the sows, causing ovarian fat infiltration, fatty degeneration of the follicle epithelium, follicle atrophy, so that the sow No estrus or delayed estrus after delivery. (3) Feeders who do not use sow-specific materials but feed sows with fattening pig material, or feed long-term feeds containing high-copper, high-zinc, etc., may also cause sows not to estrus or postpone estrus. (4) Feeding sows with mildewed feeds to disrupt the endocrine system and cause abnormal postpartum estrus. Third, the environmental impact. In summer, sows eat less and consume less energy, which causes dysfunction of hormone-secreting organs, resulting in abnormal postpartum estrus. In addition, the concentration of ammonia and hydrogen sulfide in the pig house is high, so that the body of the sow is highly stressed and will affect its normal estrus. Fourth, genital diseases. Normal maternal estrus but repeated infertility is usually due to sows suffering from endometritis. Sows suffering from infectious diseases such as blue ear disease, parvovirus disease, circovirus disease, and pseudorabies can also cause postpartum reproductive disorders. Countermeasures 1. The initial age of lean-type sows must not be earlier than 8 months of age, and the weight should be no less than 100 kg. Second, according to the sow's body condition during lactation, the amount of feed energy and protein is increased to ensure that the sow does not lose too much weight. For sows who are overweight, exercise should be strengthened and more green and juicy feed should be fed. Must not be fed with moldy feed. Third, sows give birth in the hot season, pay attention to do a good job of cooling the sun. Fourth, the treatment of the original disease. In accordance with the immunization program strict prevention of epidemic, and sows suffering from endometritis, with 6,000 ml of saline repeatedly washed the uterus, and placed in the uterus penicillin 640 million international units, streptomycin 3 million international units. Amoxicillin may also be introduced into the uterus after washing. Fifth, hormone therapy. Intramuscular injection of triple hormone 4 ml, if not estrus, 5 days after the same dose and then intramuscular injection 1, after treatment of estrus sows, 8 to 12 hours before mating intramuscularly ovulation on the 3rd 1-3. Intramuscular injection of PG600 can also be performed, with 3 to 5 days of heat after injection. For long-term non-estrus sows, 0.4 mg of cloprostenol can be injected intramuscularly.

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