1 The feeding and management of sows during pregnancy is not proper, and the development of mammary glands is not good. In the pregnancy period, the feed should be in accordance with the “high, low, high†model to ensure that the amount of feed is properly grasped, and the feed is to be nutritionally full-priced. If overfeeding occurs during the middle of pregnancy (30-85 days), high-fat diets with high concentrations of free fatty acids and low concentrations of branched-chain amino acids in the sows will act on the appetite center of the brain to reduce lactation intake. Ultimately, the decline in milk production is followed by the neglect of rearing of the sow during the second trimester of pregnancy. This often results in lean sows, poor breast development, and dry breasts, which limits milk production and results in insufficient postpartum milk. 2 Sows are old and have poor body function, and their physiological function declines; 3 The sow mating age is too early and the mammary gland is stunted; 4 Purebred female sows have unexplained lack of milk or milk; 5 Sows are overweight, have too much fat deposition in the breast, endocrine disorders; 6 The sows had poor resistance and the birth ring was unclean, causing mastitis.
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