Chickens have their own characteristics in different growth stages. Embryonic period can be used as medicine. Chickens are tender, smooth, fresh and sweet, and the older they get, the sweeter their nutritional value will be, but too old will affect their taste. On the whole, chickens are most nutritious when they are sexually mature, because they will enrich enough nutrition in their bodies when they are going to breed, which is determined by biological nature! Chicken is about six and a half months old-1 year, which is the best. Too small, the organs are underdeveloped, the muscles are not perfect, and some viruses are carried. Too big and old, with chicken poison in its mouth and claws.