Mainly from the following two aspects: (1) Feeding must be fed to the gilt special material, but can not feed the growth and finishing pig feed. The gilts need to adopt low nutrient levels before and after the high, usually 90 kg before the implementation of free food, 90 kg to the breeding period of the implementation of limited feeding and free access to food, feed 2.5 kg on a daily basis, divided 2 ~ 3 Feed and provide plenty of clean drinking water. It is critical that late-term feeding is restricted. By appropriate restriction of rearing, both the good growth and development of the gilt and the gilts can be prevented. However, the limited sows should be fed 2 weeks before the start of breeding, and 2 weeks before the start of breeding. Feeding was optimized to aphrodisiac, the daily feed volume was increased to 3.0-3.5 kg, and after feeding, it was restored to about 2.5 kg per day. (2) Management 1 Reasonable grouping: gilts are generally reared in groups of 3 to 5 heads, each with a circling area of ​​at least 0.66?. 2 proper exercise: gilts should exercise properly every day in order to enhance physical fitness, enhance the flexibility and solidity of the limbs. 3 Adjustment: In order to ensure the convenience of breeding and management of breeding sows, gilts should be cultivated during their cultivation. First, it is strictly forbidden to treat pigs roughly and establish a harmonious relationship between humans and pigs so as to facilitate future management of breeding, consignments, and post-natal care. The second is to train pigs to develop good living patterns, such as regular feeding and fixed-point excretion. 4 Regular weighing: Regularly weighing one body weight can be used as the basis for selecting the back-up pig, and the feed nutrition level and feeding amount can be timely adjusted according to the body weight to achieve the purpose of growth and development of the reserve pig. 5 Provide good environmental conditions, keep the bar house clean, dry, cool in winter and cool in summer. 6 Massage the breasts for a period of time before mating, brushing the body of the pig to make the sows have a good temperament and enhance motherhood. 7 To ensure timely estrus in gilts, stimulation of gilts in gilts can be stimulated by hoops, hoops and adult boars. For those pigs that are close to or in contact with the boar that have not been in heat after 3 to 4 weeks, strong stimuli should be taken. For example, 3 to 5 unmerited sows will be confined to a stray scented barley and hungry for 24 hours. Or every day, a boar chasing and climbing stimulate the estrus of the sow, if necessary, can use traditional Chinese medicine or hormone stimulation.