Breeding ewes is the basis of rapid propagation in sheep farms. The ultimate goal of breeding ewes is to fully tap the production potential of ewes, increase the number of sheep and improve the quality of sheep. Every year, ewes have to go through the complex reproductive physiological process of breeding, pregnancy and lactation once or twice. Every reproductive experience is an important test of breeding ewes' physique. Only by continuously optimizing the feeding management of breeding ewes in the empty pregnant period, pregnancy period and lactation period, can we ensure the physical health of breeding ewes, improve the lambing rate and lamb survival rate, so as to improve the benefit of sheep breeding.