In pigs, females who have given birth at any age are called sows. There are many kinds of sows, divided by color, including black sows, white sows and spotted sows. Their living habits are also somewhat different. Geographically, some sows mainly eat half-cooked, some eat cooked food and some eat raw materials. There are many kinds of sows in China, including Taihu pig, Landrace pig, Large White pig, Erhualian pig, Jinhua pig, Duroc pig, Pitland pig and Rongchang pig.

Sows are the basis of commercial pig production, so it is very important to select sows before buying. It is suggested that small and medium-sized farmers should not raise sows in fattening pigs.

Empty pregnancy: intramuscular injection of combined vaccine of classical swine fever and erysipelas (or combined vaccine of porcine pneumonia); Vaccinate new pigs with 1 time live and dead parvovirus vaccine, and don't inject them in the future; For the first three years, intramuscular injection of JE vaccine 1 time every March-April, and no JE vaccine after three years; Intramuscular injection of attenuated pseudorabies vaccine 3-4 times a year; K88, K99 and 987P E.coli diarrhea vaccines were injected 45 days before delivery and 15 days before delivery respectively. 45 days before delivery, intramuscular injection of the triple vaccine of infectious gastroenteritis, epidemic diarrhea and rotavirus; Subcutaneous injection of inactivated infectious atrophic rhinitis vaccine 35 days before delivery; 30 days before delivery, intramuscular injection of piglet red dysentery vaccine; 25 days before delivery, intramuscular injection of the triple vaccine of infectious gastroenteritis, epidemic diarrhea and rotavirus; Prenatal 16 days, intramuscular injection of piglet red dysentery vaccine.