Generally speaking, it is best for farmers to avoid chicks coming from hot 4 to July. One is that it is difficult to breed chickens or brood in hot weather, and it is difficult to breed and breed chickens. The other is that chickens with relatively poor physique and body weight are hard to reach the standard, which just catch up with the epidemic easily from December to April of next year. The combination of these adverse factors will undoubtedly increase the risk of breeding. The author believes that the introduction of chickens from the colder November every year to the end of January in the coming year not only has a small risk of epidemic disease, but also breeds laying hens in the whole egg production peak period, egg prices are running at a high level, and the general breeding efficiency is relatively good.