1. Maintain moderate sentiment. As the saying goes: "Easy sows are seventy eight percent of them, and it's easy to have high births." If the sow is too lean, it will show no estrus, there will be less ovulation and the eggs will have weaker vitality, which will easily lead to an empty stomach; if the sow is too fat, it will have the same consequences. At the same time, we must pay attention to the supply of protein, vitamin A, vitamin D, and vitamin E. 2, using artificial aphrodisiac. In order to increase sows' multiple births, or to promote normal ovulation in estrus-free sows and inseminated sows, the following artificial agitation measures may be taken on the basis of strengthening feeding management. (1) Use the feeling boar to induce feelings. (2) Piglets were weaned early. (3) Control breastfeeding time in parallel. (4) hormone aphrodisiac. Subcutaneous injections of 5 ml of pregnant horse serum or intramuscular chorionic gonadotropin 1,000 units. 3, pay attention to timely breeding. That is, 20-30 hours after the start of the estrus is more timely. At the same time, we must remember: "The old match is early, the match is late, and it's not the middle and the middle". For pig breeds, cultivars were allocated early, local pigs were late, and hybrid pigs were in the middle. 4, using repeated breeding and double mating. Repeated breeding means that the sow is paired with the same boar twice in one estrus period. Normally it is assigned 20-30 hours after the beginning of estrus, with a time interval of 12-18 hours. The double mating is the sow in one estrus. During the period, the use of two boars of different breeds or two boars of the same breed, each with a time interval of 5-10 minutes, can significantly increase the conception rate and the number of births. 5. Pay attention to selecting boars. Be sure to choose breeds that are pure, sturdy, energetic, sexually active, and with good semen quality. Therefore, special attention should be paid to the selection, cultivation, utilization and feeding management of boars.
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