(1) Feeding must be special feed for sows, not feed for growing and finishing pigs. The nutritional level of sows should be high before and low after. Generally, free feeding is carried out before 90kg, and the combination of limited feeding and free feeding is carried out after 90kg. Sows should be fed about 2.5 kilograms every day, divided into 2-3 times, and provide enough clean drinking water. It is very important to eat later. Proper feeding restriction can not only ensure the good growth and development of reserve sows, but also prevent obesity. However, the feeding restriction should be terminated two weeks before mating, and the feeding amount should be increased to 3.0 ~ 3.5 kg per day two weeks before mating, and then returned to about 2.5 kg per day after mating.

(2) Management ① Reasonable grouping: sows are generally raised in groups, with 3-5 sows in each column, and each sow covers an area of at least 0.66 meters ... ② Proper exercise: sows should do proper exercise every day to enhance their physique and enhance the flexibility and firmness of their limbs. ③ Training: In order to ensure the convenience of breeding pig management, training should be carried out when breeding reserve pigs. First, it is forbidden to treat pigs rudely and establish a harmonious relationship between people and pigs, which is conducive to the management of feeding, delivery and postpartum care in the future. Second, we should train pigs to develop good life rules, such as regular feeding and fixed-point excretion. ④ Regular weighing: Weighing individuals regularly can not only serve as the basis for selecting reserve pigs, but also adjust the feed nutrition level and feeding amount according to the weight, so as to control the growth and development of reserve pigs. ⑤ Provide good environmental conditions, keep the barn clean and dry, warm in winter and cool in summer. ⑥ Massage the breasts and brush the pig's body some time before breeding to make the sow docile and enhance motherhood. ⑦ In order to ensure the timely estrus of the reserve sow, methods such as adjusting the circle, closing the circle and stimulating adult boars can be used to stimulate the estrus of the reserve sow. For reserve pigs that are still not in estrus after 3-4 weeks of approaching or contacting with boars, strong stimulation should be taken, such as concentrating 3-5 sows that are difficult to breed in a boar stall with obvious smell and hunger for 24 hours, or rushing into boars to chase and climb every day to stimulate sows to be in estrus. Chinese medicine or hormone can be used to stimulate sows when necessary.