What are the physiological characteristics of meat-type breeder chickens during the growing period

Meat-type breeder chickens during the growing period: First, they are still in a stage of rapid growth and vigorous development, with all kinds of organs fully developed and their functions sound; second, the bones and muscles are in their most intense growth period, but relative growth gradually declines as age in days increases, and the relative growth during the growing period is less than that during the chick period; third, the feathers are replaced several times and finally grow into adult feathers; fourth, fat deposition increases with age in days and readily causes over-fattening. If this is not suppressed, it will affect egg production and eggshell quality during the adult period; fifth, during the middle and late growing period, the reproductive system develops to sexual maturity.