First, step by step climbing. It is suitable for sows that are primiparous and that are bred during lactation. The former is still in the stage of growth and development; the latter is a sow with heavy production tasks and high fertility. That is to say, in the early stages of pregnancy, mainly the roughage, gradually increase the proportion of concentrates, and accordingly increase the protein and minerals in the feed. Therefore, the nutritional level throughout the pregnancy should be gradually increased according to the increase in fetal weight, 5 to 7 days before delivery, the diet should be reduced by 20 to 30%. It is generally necessary to form a "low-high-high" nutritional level.
Second, catch two and care for the middle. Applicable to poorly sow sows after weaning. During pregnancy, nutrition should be strengthened to restore the body condition. Feeding concentrates, especially protein-containing feeds, should be given together with the first 20 days of breeding and 10 days after mating, and the majority of the diet should be green, juicy and feed, and fed according to feeding standards. After 80 to 90 days of pregnancy, because the fetus gains weight faster, and then feed the concentrate, it should strengthen nutrition and feed some feed rich in protein and vitamins (the latter level of nutrition should be higher than the previous period). A "high-low-high" level of nutrition has been established throughout pregnancy.
Third, the former coarse after the fine type. Suitable for mating sows with good body condition and good breast development. That is, in the early pregnancy more green feed, and later feed fine material. When sows are fed at high levels during gestation, they experience a decrease in feed intake during the lactation period and an increase in loss due to two conversions of nutrients, ie conversion of feed nutrients into body fat during pregnancy (78 %), and the double loss of body fat converted to pig milk (63% efficiency) during the lactation period. Therefore, in recent years, the limited sow during pregnancy and the sow during the lactation period have generally been used. This is the most economical way of feeding the feed and forms a “low-high†nutrition level.
Second, catch two and care for the middle. Applicable to poorly sow sows after weaning. During pregnancy, nutrition should be strengthened to restore the body condition. Feeding concentrates, especially protein-containing feeds, should be given together with the first 20 days of breeding and 10 days after mating, and the majority of the diet should be green, juicy and feed, and fed according to feeding standards. After 80 to 90 days of pregnancy, because the fetus gains weight faster, and then feed the concentrate, it should strengthen nutrition and feed some feed rich in protein and vitamins (the latter level of nutrition should be higher than the previous period). A "high-low-high" level of nutrition has been established throughout pregnancy.
Third, the former coarse after the fine type. Suitable for mating sows with good body condition and good breast development. That is, in the early pregnancy more green feed, and later feed fine material. When sows are fed at high levels during gestation, they experience a decrease in feed intake during the lactation period and an increase in loss due to two conversions of nutrients, ie conversion of feed nutrients into body fat during pregnancy (78 %), and the double loss of body fat converted to pig milk (63% efficiency) during the lactation period. Therefore, in recent years, the limited sow during pregnancy and the sow during the lactation period have generally been used. This is the most economical way of feeding the feed and forms a “low-high†nutrition level.