Step-by-step feeding method for laying period of broiler breeder

Broiler breeder chickens generally divide the laying period into three stages, the first stage is from the beginning of laying to 20 weeks of laying, the second stage is from 20 to 40 weeks, and the third stage is after 40 weeks of laying. Gradually reduce dietary crude protein (from 17% to 16% to 14% to 15%), while considering the effect of ambient temperature on feed intake and eggshell quality, increase protein and calcium content in summer, egg weight increases after 40 weeks, chicken calcium metabolism ability decreases, eggshell thinning should be appropriate to add calcium.