The phenomenon of negative weight gain in piglets within 1 week after weaning is called systemic wasting syndrome after weaning. The syndrome has different degrees of influence on growth status, survival rate, and future growth and development of piglets during the nursery period. According to many years of breeding experience, grasping the feeding and management of pregnant sows is very important to improve the birth weight of piglets and the lactation rate of sows, and to prevent systemic wasting wasting syndrome after weaning. The traditional mode of feeding pregnant sows is to "grab the middle between the two." This method is more general in terms of time, and it is not easy to grasp the timing of arguing. Excessive fertilization results in too much sow and a reduced feed intake at later stages, which affects the growth of the embryo during embryonic development and the development of the mammary glands. According to the developmental rules of embryos and mammary glands, the gestation period can be divided into five stages for raising, so as to increase the birth weight of the piglets and the lactation rate of the sows so as to obtain a better birth weight of the piglet. The stage is divided into: 4-30 days of pregnancy, 31-60 days, 61-85 days, 86-100 days, 101 days to 2 days before delivery. According to the requirements of each stage, feeding and management.
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