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How to scientifically improve the nutritional level of pigs

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1. Nutrition of gilts. The nutrition of gilts and the related nutritional reserves are important factors affecting the lifelong performance of sows, and their nutritional level should ensure the body's needs during the reproductive period after maturity. Starting from a body weight of 45 kg, the diet level should be 0.1% higher than the usual growing-finishing pig diet to enhance the skeletal development of gilts. After gilts reach about 150 days of age and enter the replacement gilt herd, their growth should be controlled, with restricted feeding (2.3-2.8 kg/day) of a medium-energy, high-protein diet to reduce

1. Nutrition of gilts. The nutrition of gilts and the related nutritional reserves are important factors affecting the lifelong performance of sows, and their nutritional level should ensure the body's needs during the reproductive period after maturity. Starting from a body weight of 45 kg, the diet level should be 0.1% higher than the usual growing-finishing pig diet to enhance the skeletal development of gilts. After gilts reach about 150 days of age and enter the replacement gilt herd, their growth should be controlled, with restricted feeding (2.3-2.8 kg/day) of a medium-energy, high-protein diet to reduce their body growth and reduce fat deposition in their bodies.

2. Nutrition of pregnant sows. The nutritional needs of pregnant sows are divided into: maintenance + the sow's own growth + uterine development. The nutrient needs of the fetus are very small during the first two-thirds of gestation, so the feed intake adjustment during this period is only carried out according to the sow's body condition and the sow's need for body weight gain during this period. During the last one-third of gestation, the fetal growth rate increases greatly compared with the early and middle stages, so the feed intake of sows in late gestation must be increased to meet the increased nutrient needs of the rapidly growing fetus during this period. For the sow's body weight gain during gestation, 30-40 kg for primiparous sows and 30 kg for multiparous sows is ideal.

3. Meet the nutrient needs of lactating sows. The nutrient needs of lactating sows vary with the individual and are affected by parity, piglet birth weight, litter size, lactation period and weaning weight. The energy needs of lactating sows can be estimated by the following formula: total energy requirement = maintenance + production (lactation). The sow's body weight loss should be controlled within 10 kg. If the body weight loss is more than 15 kg, it will prolong the interval to mating and affect the subsequent litter size.

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