First, sows should be fed twice the normal amount of quality feed every day within 10–14 days of sow mating. This will stimulate sows multiple ovulation, increase insemination, and produce more fleas at delivery. 2. From the third day after weaning on the weaned swine, add 200 mg of vitamin E and 400 mg of carotene to each sow, and reduce the amount of these two additives by half after feeding the sows. , fed 21 days after pregnancy. This method can not only increase the number of sows calving, but also can strengthen the sows and piglets body and improve the survival rate of swine fever.