One of the reasons for the low birth rate of sows is that the fertilized eggs die early in the development process and are absorbed by the sow's body. The following measures can effectively prevent the sow's chemical transformation.
1. Strengthen sow pre-conception management. Adding protein feeds and energy feeds 3 to 14 days before breeding, adding minerals and multivitamins at the same time, making them quicker to enter the best state of breeding, and strengthening nutrition for lean sows for a longer period before mating. As far as possible to restore the previous physical strength, in order to facilitate breeding, pregnancy, miscarriage, and increase litter size.
2. Timely breeding. The sows mated in the estrus 24 hours to start ovulation, from the estrus expression point of view, from the excited state to a quiet state, the vaginal discharge of silky mucus, hand pressure sow back, sows do not move, this time the best breeding, This results in low embryo mortality and high litter size.
3. Adjust endocrine. One week after mating, 30 mg of progesterone was intramuscularly injected into each sow, which effectively reduced embryo death and prevented stillbirth.
4. Pay attention to feed quality. Pregnancy sows do not receive mildew, freezing and other contaminated feed. Otherwise, poisoning may easily occur, light embryos may cause death, and severely affect the life safety of sows. 5. Maintain the ambient temperature. In the first week of pregnancy, when the ambient temperature is as low as 32°C~35°C for a short period of time (24 hours), the embryonic death increases. Similarly, if the breeding of hot boars results in embryonic death, it is best to The ambient temperature is controlled at 15°C~25°C. 6. Appropriate activities. Sows do not exercise regularly during pregnancy. Embryo mortality is about 0.5% higher than that of regular sows. Sows should exercise in a free movement, but should prevent sows from falling or hitting obstacles.
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