To maintain a good body condition and reproductive performance of sows, selection and control of sows at each stage of feed is one of the key measures in breeding. Sows breeding can be divided into four stages: backup period, weaning period, pre-pregnancy and late pregnancy. The selection and control of these four stages of feed should vary according to the condition of the sow. Backup period During the reserve period, the sows are in the stage of growth and development. High-quality, nutritious feed is essential for sow's body development and reproductive system development. In the sow feed selection of less than 6 months of age, the large pig feed (preferably 1:1 with green feed) is allowed to freely feed. Sows from 6 months of age to pre-sowing choices choose to sell open air (preferably 1:1 with green feed). Cottonseed cake, rapeseed cake, and moldy feed that are harmful to the reproductive system are strictly prohibited at this stage. Appropriate feed restriction to prevent sows from becoming overweight, affecting estrus and ovulation. Weaning period Empty period refers to the period from normal weaning to pre-breeding. After a sow is weaned, the estrus can be mated for a week or so. The selection and control of the material at this stage will affect the reproductive cycle of the pig. Empty sows often have weaning stress from 1 to 3 days after weaning, which can easily cause mastitis and high fever. At this point, it is important to control the amount of feed fed on a day in combination with fattening sows. Two meals a day, quantitative feeding, must not allow them to freely eat and cause these diseases. The choice of material should not be changed suddenly. We should choose big pig feed or empty material on the market. Within 3 days after weaning, gradually replace the feed material with empty material or large pig feed, and increase the bran and bran. Greenish green feed. Pre-pregnancy Pre-pregnancy refers to the period from the middle of pregnancy to 80 days of pregnancy. The control of the material at this stage plays a catalytic role in breeding fetuses and increasing number of births. Empty sows continue to limit feeding after mating, regular timing, feeding 2 kg to 2.5 kg per day is appropriate (depending on sow fat and thin body conditions), appropriate increase in green fodder. After feeding for 20 days, the normal food intake of sows was gradually restored. The choice of feed should be full-price pregnancy material sold on the market. Feed moldy, spoiled, frozen, and irritating feeds to prevent miscarriage. Late pregnancy It refers to the stage of delivery to the fetus after 80 days of pregnancy. At this stage, the fetus develops rapidly, and calcium and nutrient needs increase rapidly. Poor choice of material can easily cause sow pigs and piglets to be weak and sick. This stage is what is usually referred to as "craving." The choice of material should be gradually changed into a feeding material, and bone soup should be properly fed. If the feed permits, dry fat or oil can be added to the daily feed to increase the birth weight and survival rate of the piglet. Feeding method is regular timing, quantitative intake, feed 2.5 kg to 2.8 kg per day is appropriate (depending on the sows may be determined). It is also important to note that pregnant sows increase their feed 7 days before delivery. For sows with superior lyrical condition, reduce the material on the basis of raw materials so as to avoid over-concentration of milk in the post-partum period, which causes the piglets to inhale and cause mastitis; for sows, poor sows, appropriate feeding to meet the postpartum The need for lactation fenleijieshaohui fang zai na li ne guanjianci Ganzhou Green days Biochemical Technology Co., Ltd. , http://www.tlqcjs.com