The early death of swine embryos and their absorption by sows is commonly referred to as chemical fertilization. Fertilization is one of the main reasons for the low birth rate of sows, and necessary measures must be taken to prevent them. 1. Strengthen the feeding and management of empty sows In the 3 to 14 days before breeding, increase protein feed and energy feed, add minerals and vitamins at the same time, so that the sows enter the best state of breeding sooner. For empty sows with poor lyricism, nutrition can be strengthened for a relatively long period of time before mating, and lyrical and physical strength can be restored as far as possible so as to facilitate breeding, abortion, and miscarriage, and increase litter size. 2, timely mating sows mating arrangements are best in the 22 to 24 hours after the onset of estrus. From the point of view of estrus, the sows turned from extreme excitement to quietness, white silky mucus flowed out of the vagina, and the best breeding was with the hand pressed back sow sow (status reflex). The mortality of the embryo was low. The farrowing rate is high. 3. Endocrine regulation Within 7 days after mating, 30 mg of progesterone is intramuscularly injected into each sow, which can effectively reduce embryonic death and prevent sow fetalization. 5, control the ambient temperature sows in the first week of pregnancy, the ambient temperature within a short time (24 hours) up to 32 ~ 35 °C, the embryonic death increased. Breeding with heated boars can also result in embryonic death. Therefore, it is best to control the ambient temperature between 15 and 25 °C. 6. For sows that do not exercise for a long time, the embryo mortality is higher than that of regular exercise. The sow should exercise in a free movement, but should prevent the sow from falling. In addition, it is necessary to prevent and cure a series of reproductive system diseases in a timely manner. Suzhou Xuanweicheng Biotechnology Co., Ltd , https://www.xwc-medical.com
4. Improve feed quality Sows during pregnancy, feed quality is better, it is forbidden to use mildew, pollution, frozen feed feeding, or prone to food or pesticide poisoning, ranging from embryo death caused by poisoning, while affecting the sow's life safety .