1. Reasons why the sows do not feed on their intake: (1) The housing temperature is high, humidity is high, and ventilation is insufficient. When the barn temperature exceeds 33°C, the sow's breathing will be significantly accelerated and the feed intake will be significantly reduced. Open-style pig houses in the South should pay attention to the height of the barn, and take measures such as cooling the roof by spraying water or planting trees and vines to reduce the sun's radiation. Closed-type pig houses in the north can use negative pressure ventilation, wet curtain cooling and other measures. (2) The unreasonable formula can also cause the feed intake not to go up. (3) Feeding too much into the pre-pregnancy period, resulting in over-obesity; and feeding too fast in the first week after giving birth can lead to a loss of feed intake during lactation. (4) Change the feeding dry material to wet material, adjust the feeding time (early and late summer when the day cools and feed more), and feeding two meals a day can improve the intake of food. 2. The main reasons for sucking yellow piglets and piglets: (1) Too little or too much milk can cause yellow and white piglets. In piglets with a small litter of piglets, the piglets that eat the rear teat are generally under-lactated; for the oversized piglets, the piglet that eats the teat in front of the piglet is usually over-emulsified. This can be used to determine the level of materials and adjust them. (2) Yellow and white diarrhea occur within one week after birth, which is generally caused by poor sanitary conditions and caused by bacteria or viruses. Attention should be paid to the disinfecting of the maternity ward and the sterilizing of pigs before sow feeding, which can be used for feeding in one week after prenatal and postpartum. Chinese medicine preventive health care (viral diarrhea must be combined with the sow's immune status control). 3. Common causes of abnormal estrus in the sow after weaning: (1) Serious loss of estrus during lactation and no attention to aphrodisiac feeding after weaning. (2) If the primiparous sows do not reach the fit weight and age, mating will lead to abnormal estrus of the second child (Exogenous gilts should be above 120kg, 7.5-8 months of age, and the first 2-3 estrus should be allocated first ). (3) There is a disease of the reproductive system. (4) Insufficient light and lack of exercise, away from boars, and lack of incentives to detect feelings, etc. Weaned sows are not given proper sexual stimulation. 4. Measures to promote estrus in weaned sows: (1) Reduce the shedding of sows during lactation (the key is the nutritional level and feed intake of the nursing material). (2) Three days before weaning, appropriate reductions should be made (from 6-7 kilograms per day to 3-4 kilograms); weaning to breeding should be followed by short-term excellent feeding (3-4 kilograms of milk-feeding material per day). (3) Keep the sows that have not been estrus after 20 days of weaning and the boars on the sports field and return to the farm early and late; the drug aphrodisiac should be performed 8-9 days after weaning and injected with PG600). (4) supplement vitamin E, A, C, trace element selenium or feed green feed, especially in hot summer. (5) Overweight and overweight sows adjust body lice. (6) Sows with reproductive system diseases are promptly treated.
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