Su Jiang pig (tentatively named) is a combination of traditional breeding and modern molecular genetics and breeding methods supported by scientific and technological research projects of the “Ninth Five-Year Planâ€, “Tenth Five-Year Plan†and “Eleventh Five-Year Plan†in Jiangsu Province. The method, the introduction of Duroc pig good genes, select the ideal individual cross-fixation, the method of population subculture selection, after more than 10 years of cultivation of a lean black maternal breed. At present, the selection and breeding of the lean and new meat line of Jiang Qu Hai has completed the sixth generation of breeding. The pig breed has the characteristics of rapid growth, high fertility, carcass lean meat, and excellent meat quality. First, the appearance characteristics of the body hair black, thin skin, head and medium size, ear size and forward lean, mouth medium and straight, long body, straight back, straight abdomen, full body, well-developed hind legs, with Obvious characteristics of lean pigs. Second, the production performance Su Jiang pig growth and development, 20 to 90 kilograms of fattening pigs average daily gain of about 700 grams, weight ratio of 3.1:1, carcass lean percentage was 56%, fresh meat, delicious taste. The average daily weight gain during the fattening period was 710 grams for the commercial pigs produced by breeding Landrace and Su Jiang sows, the carcass lean percentage was 61.8%, and the feed ratio was 3.1:1. Su Jiang pigs have higher fertility. The average number of litters born in the first-born sows is 11. The number of litters born in sows is 13.5 to 15. Sows have good motherhood, strong physique, and high survival rate of weaned piglets. Third, the reserve boar feeding and management 1. Nutrition and feeding dietary crude protein levels of 18% to 20% is appropriate, fed 2 to 3 times a day can be, feeding limit to 2 to 3 kg, strengthening the breeding period nutrition. 2. Suitable temperature The suitable temperature is 18~20°C. 3. Exercise should be conducted every day to allow the boar to exercise, in addition to the sports field, but also to drive away. 4. Semen quality checks The reserve boar is checked once or twice a month. Before and immediately before use, the semen is checked for 2 or 3 times. The boar with poor semen quality cannot be bred. 5. Tune to 6 months of age to start training, in the training, should choose estrus stable sows, sows and training boar body size similar. When the reserve boar first climbs, if the direction does not correspond to patient training, the assistant boar inserts the penis into the sow's vagina and completes the ejaculation. 6. Use the back-up boar that is just starting to use once a week; the boar that is 1 to 2 years old should not be bred more than once a day, and should continue to rest 2 days after 2 to 3 days; boars that are older than 2 years old should be used. , should not exceed 2 times a day, 2 times should not be less than 6 hours, at least 2 days off every week. 7. The service life is generally 2 to 3 years. IV. Feeding management of gilts 1. Selection criteria for gilts (1) Screening from the offspring of high-yielding sows, at least 13 of the same fetuses, and piglets weighing 0.9 to 1.2 kg. (2) The gilts have at least 6 pairs of well-developed, well-distributed nipples, of which at least 3 correspond to the umbilicus. (3) Good body shape, sound physical condition, well-proportioned, straight line, and strong and tidy body. (4) Physical health, no genetic defect in the same fetus and the same fetus (such as ankle, anal lock, etc.). (5) The external genitalia develop well, the motherhood is good, and the resistance to stress and stress are strong. 2. Nutrition and Feeding The nutritional level of the diet is 15% to 16% of crude protein and 3.05 to 3.15 megacalories/kg of digestive energy. Before 4 months of age, free intake; from 4 months old to 15 days before mating, reduce the amount of formulated feed (1.8 to 2.2 kg per day), increase the amount of green roughage; 8 to 9 months of age breeding, 15 days before mating began to aphrodisiac Supplementary feeding, increase the nutrient supply, increase the amount of feeding (3 ~ 3.5 kg per day), promote estrus estrus, ensure that the fetus is bred. 3. Induced gilts weighed 80-90 kilograms, and when they reached 8 to 10 months of age, they began to be tempted. The method of inducing boars has boar sympathy, supplementation aphrodisiac, stress aphrodisiac, and gregarious aphrodisiac. 4. The initial distribution age and the use of the first parity with the age of 8 to 9 months, weight 90 to 105 kg, sow use time of 7 to 8 times. 5. After the third estrus of the sow is bred for breeding, it should not be too early or too late. V. Feeding management of piglets 1. Feeding and management of suckling piglets (1) Eat colostrum as early as possible. After the piglets are born, they should eat colostrum in time, and at the same time, fix the nipples and put strong piglets on the back of the nipples to ensure even growth of the same litter. If the sow has less effective nipples, the piglets must be fostered. (2) Strengthen insulation, antifreeze and pressure. Infrared light, warm bed, hot plate and other methods to give warm. Initially, the piglet is fed with breast milk once every 1 hour and gradually extended to 2 hours or longer. After 3 days, the sow can be breast-fed. Outside the nursery column installed in the column, set up day and night duty system, pay attention to inspection and observation, do a good job of nursing. (3) cutting teeth. When the piglets were born, they had 3 sharp upper and lower third incisors and 3 canines teeth. They needed to be cut flat from the roots with a pair of pincers to prevent the piglets from competing for grabs and hurt the cheeks and sow's nipples. (4) Broken tail. Use a scalpel or sharp scissors to cut off the last 3 caudal vertebrae and apply drugs to prevent infection and prevent piglets from biting each other. (5) Prevention of piglets jaundice. Later in pregnancy, the sow is required to be vaccinated. (6) Feeding. Piglets start feeding for 5 to 7 days after birth. (7) Weaning. Piglets suitable for weaning are 28 to 35 days old. When weaning, we adopt sows and piglets to minimize stress on piglets. 2. Feeding and Management of Weaned Piglets (1) Grouping. It is recommended to adopt the original litter cultivation and transfer the litter of litter (excluding individual dysplastic individuals) to breeding and rearing in the same column. If there are too many or too few litters in the original litter, they may need to be regrouped, and they may be divided into groups according to their size, strength, and weakness. The difference in weight of the piglets in the same group should not exceed 1 to 2 kg and will be weak in each litter. Piglets were grouped into small groups for individual rearing. The quarrelling piglet will have a fighting position and can be properly guarded to prevent bites. (2) Feeding temperature and humidity. The suitable ambient temperature for weaning piglets is 21-22°C, and the relative humidity in pig stables is 65%-75%. (3) Training. The emphasis is on the training of the newly weaned piglets in feeding, lying, drinking, and a fixed position in the discharge area to form an ideal sleeping and excretion area. (4) Castration. It is recommended to castrate about 35 days after birth and weigh 5 to 7 kg. Or piglets can be castrated early after 7 days of age to facilitate recovery.
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