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Five selections of sows
One off. When the piglets are 30-40 days old, all piglets that meet the characteristics of the breed, develop well, have more nipples (7 pairs or more) and are arranged neatly, can be preserved. Two off. In a 4 month old sow, healthy ones can be kept as seed except for defects, stunting, or illness. Three off. At 7- to 8-month-old age, the body should be selected for long, large abdomen without sagging, large hindquarters, and sows with well-developed nipples reserved for species use. Four off. The primiparous sows have full breasts, obvious intervals, non-stick grass and long drainage time, and tamers are advised to keep seed. Five off. The sows have significant post-partum shedding, rapid recovery during pregnancy, and rapid weight gain, which is what people often say. The mother is thin and strong. During lactation, good appetite, good digestion and absorption should be reserved.