(1) During the pregnancy of the sow, let it have proper exercise. At noon every day before feeding, drive it up and feed again.

(2) In the late stage of sow pregnancy, less raw material should be given, more concentrate should be fed, and some bone minerals, salt, and other minerals should be added to meet the fetal growth and development needs; however, it is not possible to feed soybean cake or peanut cake, etc. In order to avoid overfeeding and affecting farrowing and lactation.

(3) During pregnancy, sows must be prepared for epidemic prevention, to prevent infectious diseases, and not to feed on distiller's grains and moldy feeds.

(4) When sows are mated, it is best to use artificial insemination. Do not mate with the father and son boars that are close to their ancestry to avoid inbreeding.

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