Under flat-breeding conditions, cocks prefer to mate with their grown hens. Each rooster occupies a certain area or sphere of influence in the flock and also controls a certain number of hens. The specific control of the area of ​​the ground and the number of hens were sorted according to the population advantage. The dominant cockerel sites were larger and the number of hens mated was more. It is generally belligerent and big-sized cocks have an advantage. However, the large-sized cocks have worse breeding ability than the moderately-sized or smaller-sized cocks, so the over-weighted cocks are not used as much as possible. In order to achieve the desired fertility rate in the flock, special attention should be paid to preventing the cocks that predominate in gregarious orders from increasing because they are aggressive and hinder mating activities of other cocks. For a long time, it causes a "physiological castration" state, which can even cause death. Therefore, the natural mating of chickens, the breeding density should not be too high, the proportion of male and female should be appropriate. In breeder flocks, if there are too many cocks. It is often because of scramble to fight, ham, and interference in mating, which reduces the fertility rate. On the other hand, if there are too few cocks, each cock is burdened with excessive tasks, affecting semen quality, and the rate of insemination is not high. During the day, the most frequent time of cock mating activity was at 4-6 p.m. after most of the hens laid eggs. When hens have hard shell eggs in their uterus, mating is usually not accepted. Because the cock mating activity is too concentrated, the appropriate ratio of male and female is even more important. The appropriate male-female ratio is: 1:15-1:8 for light-egg chickens, 1:12-1:15 for medium-sized eggs, 1:8-1:12 for breeders, and 1:10-1 for turkeys. :12. When natural mating, the rooster is put into the hen group one month before the collection of the eggs is started, so that the flock is formed as soon as possible. The young rooster was placed in a two-age hen group. The rooster was initially in a position of being oppressed and could not be normally mated. It took weeks to gain dominance. The fertilization rate of young cocks placed in the hens after forced moulting will be higher. The male and female hens in the flock are both gregarious and competitive, resulting in the emergence of rulers and obedients in the flock and the formation of group order or division into different ranks in the flocks. The hens with strong status bully the hens with weak status, and the latter often adopt a submissive posture with squatting and drooping wings, much like accepting cock mating. The generally dominant cock breeds the most frequently with the hen and the weaker cock can sometimes mate. Therefore, the insemination rate of hens, which are generally dominant in group order, is relatively low. Because of the fighting and the ordering of the flock in the flock, it is best to feed the cocks or hens in the same cohort in the past, and the number of cocks that were initially placed is 10% more than the number of cocks in the normal ratio. %, to prepare for the death and elimination caused by the initial struggle. When shifting groups, it is necessary to pay attention to the same column of chickens in the same column as far as possible to reduce the fighting. At the beginning of the mating season, fertilized eggs can be obtained on the 2nd day of the hen's group (excluding the day), and the fertility rate for the whole group is 5-7 days later, so 7-10 should be advanced. The rooster was put into the hens.