(1) Ensure that the normal estrus and ovulation have significant differences between the actual fertility and the potential fertility of adult sows. In order to achieve high fertility for multiple births, the breeding and management of the sow mating must be strengthened so as to provide a large quantity and good quality. Eggs lay the foundation for high yields. During the preparation period, all necessary and essential nutrients should be supplied to maintain a moderate degree of sensation. If the sow is too lean, it will show no estrus, low ovulation, weak egg viability, and can easily lead to an empty stomach; if the sow is too fat, it will also cause the same result. Special attention should be paid to the supply of protein, which generally requires 12% protein per kilogram of diet. Sows that are bred during lactation should appropriately increase protein supplementation. If the supply of protein is insufficient or the quality is imperfect, the development of the egg will be affected and the number of ovulation will be reduced and the conception rate will be reduced. The sows are extremely sensitive to the lack of supply of calcium, which can cause unsusceptibility to fetuses and reduce litter size. In the diet should be provided 1.5 grams of calcium, 10 grams of phosphorus, 15 grams of salt. Vitamins A, D, and E are important for the reproduction of sows. Insufficient vitamin A in the diet will reduce the vitality of sexual function, affect the maturation of follicles, cause infertility, and delay the estrus after weaning of sows during lactation. Lack of vitamin D can affect calcium and phosphorus absorption and cause metabolic disorders. Lack of vitamin E can cause infertility. In the diet, vitamin A supplied 4 000 IU per kilogram, vitamin D 280 IU, and vitamin E 11 mg. According to the nutritional needs of the sow breeding preparation period, each day head should be fed 4 to 5 kg of juicy feed or 5 to 10 kg of green feed, with a certain amount of concentrate feed. This has a good effect on the number of ovulated eggs, the quality of the eggs, the consistency of ovulation and fertilization. Sunlight, exercise and fresh air have a great influence on promoting estrus and ovulation in sows. Sows with good body condition should strengthen exercise and increase the time for outside activities during preparation of breeding. Keep the house clean and keep the grass in the cold season. (2) Improving the feeding and management of gilts Based on the growth and development rules of gilts, pigs are fully utilized during the peak period of growth to intensify feeding. The gilts should be intensified and must have certain activities. Should be fed 2 to 3 times a day, and the amount to be fed should be 2/3 of the equivalent amount of hog. For sows of high product species, they all expect that their initial situation will come earlier. In this case, they should take irritation measures. The stimulation time should start from 140 days, and use boar contact and exogenous stimulation to stimulate the development of the sows. Sows are estrus early. The second estrus of young sows began, increased the amount of feed, and with exercise to adjust the normal development of sows. When the second and third estruss occur, they are bred. At this time, the best breeding time is between 10 and 30 hours after estrus. The sow estrus period is 16 to 25 days with an average of 21 days. (III) Feeding management of pregnant sows In order to improve the reproductive ability of sows, firstly, the sows should be eliminated in a timely manner, and the basic sow population structure should be kept in a good state of circulation. It has been proved by practice that the rational breeding herd structure is 17% for young sows, 60% for 3-6 sows, and not more than 10% for sows with 7 or more sows. This group structure is an important guarantee for maintaining the best reproductive performance of sows. The feeding of pregnant sows on the premise of the green roughage is different due to the characteristics of various pregnant sows. 1. Grab two heads and take care of the middle feeding method. This method is suitable for lean sows after weaning. Sows consume a lot after delivery and after a lactation period. In order for it to assume the reproductive tasks of the next stage, it is necessary to strengthen nutrition during the early stages of pregnancy so that it can quickly resume its reproduction. During this period, the total number of breeding days is about 30 days before the breeding period. At this time, concentrates should be added, especially feeds containing high protein. After the body condition is restored, mainly the green roughage, and raised according to the feeding standards until 80 days after pregnancy. , Plus feeding fine material to strengthen the nutritional needs. This feeding method has formed a high and low nutritional level. However, the nutritional level in the later period should be higher than the pre-pregnancy period. 2. Gradually high feeding methods. This method is suitable for the production of sows and breeding sows during lactation, the former itself is still in the growth stage, the latter production tasks, nutritional needs. Therefore, the nutritional level during the entire pregnancy is gradually increased according to the increase in the weight of the fetus, reaching the peak 1 month before delivery. The feeding method is generally based on the green roughage in the early pregnancy, and then gradually increase the proportion of concentrate, and To increase protein and mineral feeds, diets should be reduced by 10% to 20% from 3 to 5 days before delivery. 3. Pre-coarse fine rearing methods. This method can be used for sows that have good pre-breeding conditions. Because the fetus is very small at the beginning of pregnancy and the sows are in good condition, according to the nutritional requirements before mating, more roughage can be fed to the diet to meet its nutritional level. This level can basically meet the needs of fetal growth and nutrition, to the late pregnancy, due to fetal growth and development, plus feed fine material. Feed for pregnant sows should pay attention to hygiene and quality assurance. Moderate, rotten, deteriorated, frozen, toxic, and highly irritating feeds should not be used to feed pregnant sows or they may cause miscarriage. Frequent feed conversions are also inappropriate for the function of pregnant sows and need attention. In the first month of pregnancy, the sow is mainly to restore physical strength, so that the sow eats well, sleeps well, and does little exercise. After 1 month, the sow is allowed to exercise adequately, and it is usually exercised for 1 to 2 hours per day. The hot summer weather should pay attention to heatstroke prevention, and winter cold should pay attention to keeping warm. (IV) Feeding management of farrowing sows 1. Prenatal preparation. According to the projected sow's due date, the sow room should be prepared within 5 to 10 days before sow production. It requires drying, heat preservation, sufficient sunlight, and fresh air. The production circle must be strictly disinfected, and the mat should be cut short after drying. Before entering the lap, the sows shall remove the sludge from the pig's abdomen, breasts, and vulva, and then use 2% to 5% of the solution of Lysol to be disinfected, cleaned, and wiped dry. 2. Delivery. A quiet environment is important for normal delivery. Usually the sows give birth more at night. During the entire production process, it is required to keep quiet, quickly and accurately. After the piglet is produced, the confinement worker should immediately remove and wipe the mucus of the mouth and nose with his fingers, wipe the whole body with a rag, and squeeze the blood in the umbilical cord to the direction of the abdomen of the piglet, then remove it from the abdomen. Cut the umbilical cord at 5 cm. The umbilical area should be disinfected with iodine before surgery. For euthanasia, the piglets should be rescued. If they fail to produce more than 3 hours, they should be regarded as dystocia, and artificial midwifery should be carried out immediately. After the birth of the piglets, they should be sent to the sows for feeding immediately. Some individual piglets will not receive milk after they are born and need artificial assistance. In the cold season, the pens must be kept warm. Otherwise, the piglets will not open their mouths for feeding due to freezing. 3. Feeding and management of postpartum sows. After the production is completed, blood, genitals and hindquarters should be immediately cleaned with warm water and disinfectant, and the bedding must be replaced and disinfected to prevent infection. Immediately after removal of the placenta, it prevents the sows from eating and causing dyspepsia and the formation of dysentery. Observe the sow's breathing, body temperature, excretion, and breast condition at any time, always keep the delivery room quiet, and allow the sow enough time to rest. Three days after childbirth, if the weather is good, the sows can be allowed to move freely outside the house, and the sows and piglets can be trained to develop the habit of excreting urine at a fixed location outside the house. 2 to 5 days to feed the digestible full price diet, brush the skin, promote blood circulation, increase mat grass, and prevent acne. Mosquito Swatter Mosquito Swatter Ningbo JustLive Electrical Appliance Co., Ltd , https://www.makeheat.net