1, hormone stimulation
Cock crowing is the cause of the harm of androgen, and only cocks that secrete androgen can crow, while capons, estrus-less cocks and their hens will not crow. If androgens are continuously injected into hens, hens will crow after a period of time.
2. Physiological reaction
There is an area called the pineal gland in the cock's brain. In the case of poor sunlight at night, the pineal gland will secrete melatonin and inhibit the secretion of estrogen. After dawn, the light source will be improved and the secretion of melatonin will be inhibited. At this time, the cock's estrogen will start to secrete, making it crow.
3. Declare sovereignty
Cock crow is a manifestation of declaring territorial sovereignty. Roosters have a strong sense of crowd and territory. Roosters in estrus will start crowing, show their strength and ability to other hens and cocks, gain the goodwill and trust of hens, and also have the effect of shocking invaders.
Breeding method of rooster
1, separate feeding of males and females in brooding period: this can not only carefully manage breeders in brooding period, but also effectively control the weight of cocks in the future.
2. The feeding management method is the same as that of female chicks: the feed amount is calculated flexibly according to feeding standard. 1 ~ 7 days old, feed by tray, and use bucket after 1 week. The height of the bucket should be adjusted at any time according to the height of the back of the male chick.
3, correct beak cutting: the age of beak cutting is generally controlled in 6 ~ 8 days. It should be noted that the beak of breeder chickens must be accurate, and cutting long and short will seriously affect the ability to catch chickens in future breeding, thus seriously affecting its breeding potential. The standard of beak breaking is 2 mm from the edge of nostril to the breaking point. Before and after beak breaking, some multivitamins should be added to relieve stress.
4. Early limited feeding: In order to better control the weight of roosters, the feeding restriction scheme can be implemented for breeders over 4 weeks old. Practice has proved that this can not only reduce the stress, but also control the weight of the cock at 130% ~ 140% of the weight of the hen before mixing.
5, the end of the brooding period is strictly controlled. First choice: At the end of the brooding period, healthy, disease-free, robust cocks with straight legs and toes and wide back and chest should be selected for breeding.