In the process of rearing sows, the dietary variety has a single nutritional loss ratio, the feeding amount is too much or too little, the sows are prone to grow too fat or too thin, and the occurrence of estrus abnormalities, fewer litter size, excessive stillbirth, piglet survival rate Low issues. Tests have shown that high-energy diets can easily lead to an increase in the number of embryonic deaths and a decrease in the birth rate. Low energy diets can lead to birth. Weaning piglets have a significant reduction in post-partum lactation and weak postpartum lactation. Calcium deficiency or calcium deficiency in the diet for a long period of time can result in stillbirth, weak appetite, and lack of milk and sputum: lack of carrot or vitamin A prolific stillbirth, deformity and weak appetite. This shows that it is important to provide complete nutrition for pregnant sows. Different breeds and different types of sow feeding standards are different. General pregnant sows should contain digestive energy of 11:7 MJ protein 14%-15%, calcium 0.60%, phosphorus 0.4%, salt 0.32%, vitamin A3250-3300 international unit, vitamin D65 international unit, Vitamin E8 International Unit, Carotene 13 mg. During the gestation period, an average of 2 kilograms was fed, and the specific daily dose should be adjusted according to the gilt condition of the pregnant sow and the law of fetal development to ensure moderate body condition. For sows that are poorly fed after weaning, 10 days before breeding and 20 days after breeding. Feeding concentrates, especially feeds containing protein. After the body condition is restored, feed the green-based diet until 84 days after pregnancy, and then add more concentrate, but the nutritional level should be higher than the previous period. For sows that are born between sows and lactation, sows in the first trimester of pregnancy are mainly green forages. Afterwards, the concentrates are gradually increased. The proportion reaches the peak at about 84 days of pregnancy and then continues for a period of time. In the previous week, the concentrate decreased gradually. 3 days before delivery, concentrates are reduced to half. Pre-breeding sows with good body condition had lower levels of nutrition during the pre-pregnancy period, and the feed was concentrated on the 30th day of the second trimester.
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