1. Timely breeding. Sows usually ovulate at 24 hours of estrus. It is best to sow when the sows turn from excitement to quietness, vaginal discharge of silky mucus, and sow rearing sows on their backs. In this case, the embryos are bred. The mortality rate is low and the sows have a high birth rate.
2. Strengthen sow management before conception. Before 3 to 14 days of breeding, protein feeds and energy feeds are added. At the same time, minerals and vitamins are added so that sows can enter the best state of breeding sooner. For lean sows, they should be kept for a longer time before mating. Strengthen nutrition so that it can restore as much as possible to the previous physical strength, in order to facilitate breeding, pregnancy, miscarriage, and increase litter size.
3. Pay attention to feed quality. Do not feed feeds that have become mildewed, frozen, or otherwise contaminated during gestation. Otherwise, sows are prone to poisoning, lighter embryos are killed, and sows are more likely to be life-threatening. Monthly regular addition of 0.1% Xingchao "mildew net" in feed for 5 to 7 days, can effectively inhibit the growth of mold, prevent feed mold and mycotoxin production, ensure feed quality.
4. Appropriate activities. Sows with infrequent movements during pregnancy have about 0.5% higher embryo mortality than those who exercise regularly. Sow movement should be based on free exercise, but to prevent the sow from falling or hitting obstacles.
5. Regulate endocrine. One week after mating, 30 mg of progesterone was intramuscularly injected into each sow, which effectively reduced embryonic death and prevented sows from slipping.
6. Maintain the ambient temperature. In the first week of gestation, when the ambient temperature is short (24 hours) as high as 30°C to 35°C, the embryonic death increases. Similarly, if the boar is bred with a heated boar, the embryo will also die. Therefore, it is best to control the ambient temperature to 15°C to 25°C.
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