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What to do if a sow on a large-scale pig farm does not have heat
First, the cause: 1, gilt reproductive system, incomplete or slow development, inhibited the initial period. The use of fattening pigs to raise gilts results in excess energy in the sows, and insufficient or incomplete protein, vitamins, and trace elements affect the normal development of the sow's ovarian function and reduce the sensitivity of the ovaries to gonadotropins. The sow is not estrus. Tested, underdeveloped or retarded sow ovaries were 2-3 grams lighter than normal sows. 2. Single sow feed, too much weight loss during lactation, resulting in too thin a sow during weaning, inhibiting gonadotropin-releasing factors produced by the hypothalamus, lowering the secretion of luteinizing hormone and follicle stimulating hormone, delaying the production of the first born or the mother The pig's estrus again. 3, postpartum bacteria or viruses invade the sow's metritis, ovarian inflammation or ovarian cysts and other diseases, resulting in uterine effusion or persistent ovarian corpus luteum exists, affecting the sow's recurrence. Second, treatment: 1, good physical condition, appearance, health, moderate sensation, normal appetite is not estrus sows. Vitamin E can be added to their diet, 400-600 mg a day, even feed for 3 days, for a few sows that are still not in heat, after 2 days of withdrawal, a course of treatment can be given, and breeding can be performed after estrus. 2. For sows that are deficient in nutrients after weaning and are over-slim, sows should be fed with concentrated feed so that sows can restore their body condition as soon as possible. In addition to supplying enough energy and protein feed, the feed should also meet the needs of its minerals and vitamins. 3. Aphrodisiacs may be used for gilts who have not reached the mating age, and for first- and post-natal sows that have not been estrus for more than 20 days after weaning. According to the pig's weight, intramuscular injection of triad hormone 2-4 ml, general estrus after 3-5 days. According to clinical application, after the second estrus after drug aphrodisiac, sow fertility rate and litter size are the best. 4. For sows suffering from metritis, using antibiotics at the same time, with the use of saline at 40 °C rinse the uterus, after injection into the uterus injection of antibiotics or sulfa drugs, is conducive to the elimination of local inflammation as soon as possible. 5. For sows with ovarian cysts or persistent luteal bodies in the ovaries, (PG) F2a or human chorionic gonadotropin can be used for treatment. Inflammation and the corpus luteum can be quickly eliminated by inflammation. 6, oral administration of traditional Chinese medicine reminders. Motherwort 35 grams, Epimedium 20 grams, Angelica 10 grams, 25 grams of Yang from the stone, 5 grams of Dodder, 5 grams of safflower, and even fed 5 days, can be bred after estrus. Third, pig disease prevention: 1, scientific feeding. In order to grow gilts without rearing fattening pigs, gilts should be raised according to sow feeding standards, and gilts and rearing sows should be raised. 2, control weight. In the empty period of sows should maintain moderate sensation, too fat too thin will affect the estrus breeding. It is generally required that the sow before breeding be kept at 70% of the weight. 3, full price of rations. The feeding nutrients for the first-born and sow-produced sows should be complete and not single. The weight loss of a sow during breast-feeding is basically reasonable with no more than 8% of the weight at delivery, and too much will delay re-estrus. 4, look at the feed. From 4 to 7 days after weaning, the body condition of the sow was added to promote the ovulation of the sows, which was beneficial for breeding.