Selection: Selecting gilts in binary sows should select sows with flat backs, wide hindquarters, well-developed limbs, slightly higher body weight, uniform growth of body parts, sparse hairiness, and even fatness. And more than 6 pairs of effective nipples under the abdomen. For those sows who have not been estrus for a long time, fake estrus, or repeated infertility, they should be eliminated in time after drug treatment is ineffective. Older sows that have more than 8 babies and whose fertility is declining should also be eliminated. At the same time, it is necessary to arrange the breeding season rationally. It is best to arrange for sows to be bred in April-May and to be born in August-September; to breed in September-October, and to be born in 1-2 months of the following year; to be bred in February-March, to be littered in June-July, and to repeat the cycle. Sows can be bred in spring and autumn. Aphrodisiac: Pigs are estrus animals throughout the year. After a week of weaning, the sows are able to heat. If it is found that the sow standing in the ring does not move, sleep, loss of appetite, arch dangling door, frequent urination, change in the vulva, it is the performance of estrus. If you do not have heat, you can use the following measures to aphrodisiac: improve feeding and management, inducement, massage breasts, Chinese and Western medicine aphrodisiac and treatment. Breeding: It is more appropriate to mate in the morning of the second day after the estrus of the sow of the binary cross sows to the third day of the morning. However, in terms of age, it should be based on the principle of “older with early, less late, and not oldâ€. breeding. If the sow's back or buttocks are pressed by hand, the sow will stand still; or if the sow is tried to cross the sow, the sow will start breeding when it receives a climb. The initial mating age of binary sows is 8-9 months old. In addition, in order to ensure that the sow is conceived, the same boar can be mated once after the first mating, at intervals of 8-12 hours, or once in 10-20 minutes between two boars in one estrus. The use of compounding can not only increase the fertility rate and litter size of sows, but also improve the health and uniformity of piglets. Pre-pregnancy optimal feeding: 10-15 days before mating, the sows with poor body condition should add 1-1.5 kilograms per day, and feed more feeds rich in vitamins and minerals to promote multiple ovulation of sows and ovulation. Pregnancy feeding tubes: After 20 days of sow pregnancy, the embryos are highly susceptible to environmental conditions and special care is required for feeding and management. One month before the sow’s production, it should be fed to a nutritious diet. Careful and thoughtful to prevent miscarriage. Piglet Weaning: Piglets start to tune and gluttonize at 7-10 days of age, and can use full price pellet feed. By 20 days of age, they will be able to formally eat, so that they can be weaned between 35-40 days of age. Early weaning of piglets allows early sows to be estrus and early mating, increasing the number of births and litter size in a lifetime.
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