Skills to prevent sows from becoming pregnant

1. Strengthen the management of sows before conception. Protein feed and energy feed were added 3 to 14 days before mating, minerals and vitamins were added at the same time to make it enter the best state of mating quickly, and the nutrition of thinner sows was strengthened for a long period of time before mating. Restore to the previous physical strength as far as possible, in order to facilitate mating, conception, fetal preservation, and improve the birth rate.

two。 Breeding at the right time. Sow breeding begins to ovulate at 24 hours of oestrus. From the expression of estrus, the excited state changes to a quiet state, white filamentous mucus flows out of the vagina, hand pressure on the back of the sow, and the sow stands still. At this time, it is best to breed, so that the embryonic mortality rate is low and the birth rate is high.

3. Regulate endocrine. One week after mating, each sow was injected with progesterone 30 mg intramuscularly, which could effectively reduce embryo death and prevent stillbirth in sows.

4. Pay attention to feed quality. Pregnant sows should not be fed with moldy, frozen or other contaminated feed. Otherwise, it is easy to be poisoned, the light will cause the death of the embryo, and the heavy will affect the life safety of the sow.

5. Keep the ambient temperature. In the first week of pregnancy, embryo death increases in sows when the ambient temperature reaches 32 ℃ ~ 35 ℃ in a short time (24 hours). Similarly, embryo death can also be caused by breeding with heated boars, so it is best to control the ambient temperature at 15 ℃ ~ 25 ℃.

6. Appropriate activities. Sows do not exercise frequently during pregnancy, and the embryonic mortality rate is about 0.5% higher than that of regularly exercised sows. Sows should exercise freely, but to prevent sows from falling or bumping into obstacles. Guan Wenquan