Sow pregnancy begins with mating and ends at childbirth. The goal of feeding and management is to ensure the normal development of the fetus in the mother's body, prevent miscarriage and stillbirth, and produce healthy, vigorous, and significant primary pigs, while also keeping the sows in the middle and upper body condition. Pregnant sows control proper nutrition levels. China's feeding standards stipulate that when the weight of sows in the early pregnancy (80 days before pregnancy) is 90-120 kg, the daily feed intake is 1.7 kg, the weight is 120-150 kg, and the daily intake is 1.9 kg. Daily intake of more than 150 kg weight was 2 kg. During the later period of pregnancy (1 month before birth), the body weight was 90 kg to 120 kg, 120 kg to 150 kg, and 150 kg, and the daily feed intake was 2.2 kg, 2.4 kg, and 2.5 kg of compound feed respectively. Dietary nutrient levels ranged from 12% to 13% for crude protein, 2.8 to 3.0 megacalories per kilogram 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. According to the different characteristics of pregnant sows to take the appropriate feeding system and nutrition plan. For weaned sows after weaning, a feeding system and a nutrition plan were taken in between. After sowing and lactating, the sows are physically depleted and have poor constitution. In order to be able to better perform the reproductive tasks from the next stage, they must strengthen nutrition during the early stages of pregnancy and quickly restore the body condition. During this period (including the first 10 days of breeding, for a total of about 1 month), nutrition should be strengthened and supply of concentrates should be increased, especially feeds containing high protein content. After the body condition was restored, the nutrition level was gradually reduced, and the animals were reared according to feeding standards. The main course was green roughage, and 80 days after pregnancy, supplemented with concentrated feeds was used to strengthen nutrition. Form a high-medium-high feeding system and nutrition plan, especially the later nutritional level should be higher than the previous period. For the sows who are primiparous and those who are lactating, there is a step-by-step feeding plan. Especially for the primiparous sows, the body is still in the stage of growth and development, and the nutritional requirements are large, and it is more necessary to adopt this plan. Nursing sows are heavy in breeding tasks and have a large amount of nutrient requirements. Therefore, the level of nutrition should be increased based on the weight gain of the fetus and reach the peak one month before delivery. Generally, the nutrition level in the early stage of pregnancy can be lower, mainly in green roughage; then the proportion of concentrates, especially the supply of protein and mineral materials, can be gradually increased to increase the nutrition level; the diet can be reduced by 10% from 3 days to 5 days before delivery. ~20% for normal delivery. For pre-mixed sows with good body condition, take a low-to-high nutrition plan. In the early stages of pregnancy, the fetus is small and the sow has good phlegm. According to the nutrient supply before mating, it can basically meet the nutrition needed for the growth and development of the fetus. In the later stages of pregnancy, the fetus grows fast and needs more nutrients, so it is necessary to increase the nutritional level of the diet. Sow feed should pay attention to hygiene, quality assurance, mold, deterioration, freezing, toxic and irritating feeds, otherwise it may cause miscarriage, stillbirth and weaker tires. The feed should not be changed frequently, otherwise it is also unfavorable for pregnant sows. In addition, pregnant sows have a high metabolism and good appetite, and can use more comprehensive green roughage to reduce feeding costs. However, green roughage has high moisture content and large volume, but the gastrointestinal volume of pregnant sows is limited. At the same time, crude roughage has a high crude fiber content, poor palatability, and contradicts physiological characteristics and nutritional needs of pregnant sows. Therefore, attention should be paid. Green roughage processing modulation and increase the number of feeding. The nutritional needs of sows are also different at different stages of pregnancy. Pre-pregnancy (within less than one month after mating) Embryos at this stage require almost no extra nutrition, but there are two peaks of death. The amount of feed fed is relatively small and the quality requirements are high. Generally, 1.5 kg to 2.0 kg of gestation are fed daily. Sows, dietary nutrition levels for the digestive energy per kilogram of 2950 kcal to 3000 kcal, crude protein 14% to 15%, the amount of green roughage can not be too high, can not be fed mildew and toxic feed. During the second trimester (31st to 84th days of pregnancy) 1.8kg to 2.5kg sows are fed daily. The specific feed rate is determined by the sow's body condition, and the green feed can be fed in large quantities, but must be given to the sows. Eat full to prevent constipation. To prevent excessive feeding, resulting in obesity of sows. During the later period of pregnancy (1 month before childbirth), the fetus develops rapidly. At the same time, it needs to store nutrients for lactation. The sow needs high nutrition and can supply 2.5 to 3.0 kilograms of nursing sow material per day. This stage should relatively reduce the green succulent feed or silage. The amount of feed should be gradually reduced from 5 days to 7 days before delivery until feed is stopped on the day of production. Nutrient levels for lactating sows: 3050 kcal to 3150 kcal per kilogram of digestible energy and 16% to 17% of crude protein. We're professional Resectoscope Electrode
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