The nutritional characteristics of pregnant sows are to control the appropriate level of nutrition. China's feeding standards stipulate that when the weight of sows in the early pregnancy (80 days before pregnancy) is 90-120kg, the daily feed intake is 1.7kg, the weight is 120-150kg, the daily intake is 1.9kg, and the 150kg weight is more than 2kg. During the second trimester (one month before delivery), the body weights were 90-120 kg, 120-150 kg, and 150 kg, and the daily feed intake was 2.2 kg, 2.4 kg, and 2.5 kg of compound feed. Dietary nutrient levels ranged from 12% to 13% for crude protein, 2.8 to 3.0 Mcal/kg for digestion, 0.4% to 0.5% for lysine, 0.6% for calcium, and 0.5% for phosphorus. In addition, in addition to feed formula feed, in order to make sows have a sense of satiety and vitamin supplements, it is best with a variety of fine green feed or roughage.
For weaned sows that are lean after weaning, feed intake should be increased from the 10th day before mating, until breeding is resumed after breeding. For sows that have reached 70% of puberty in the first trimester of pregnancy, low pre-pregnancy levels and increased feed intake (according to feeding standards). For juvenile sows, due to their own development and the needs of the fetus, a gradual raising of the nutritional level of the feeding method should be adopted throughout the pregnancy period. No matter which type of sow, late pregnancy (90 days to 3 days before delivery) requires short-term excellent feeding, by feeding 1 kg of compound feed per head per day.
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