Lutein in sow production can increase sow litter size, piglet uniformity and labor productivity of employees, improve piglet health, and provide conditions for the smooth implementation of swine fever "super immunity".

     The specific usage of law placenta is: one day before the sow's delivery, inject 1 ml of law placenta in the vulva to control the sow's delivery time. It can be used for simultaneous delivery, shortening the birth process, accelerating postpartum lochia discharge, and reducing sow postpartum hysteritis- The occurrence of mastitis-no milk syndrome reduces the abnormal elimination rate of sows; through hormone adjustment, the amount of milk is increased to increase the weaning weight of piglets; the sow breeding interval after weaning is shortened, and the sow of the next sow is increased Litter rate.