How to feed broiler breeder chickens by stages during the laying period?

Broiler breeders are generally divided into three stages during the laying period: from the start of laying to 20 weeks of laying is the first stage, 20 to 40 weeks is the second stage, and after 40 weeks of laying is the third stage. Gradually reduce the crude protein of the diet (from 17% to 16% down to 14% to 15%), while taking into account the effects of ambient temperature on feed intake and eggshell quality; in summer, increase the protein and calcium content; after 40 weeks, egg weight increases, the chicken's calcium metabolism capacity decreases, and the eggshell becomes thinner, so calcium should be appropriately increased.