A total of 990 male broilers at the age of 7 days were allotted into 11 treatments randomly. Each treatment consists of 6 replicates with 15 broilers each.

• 选取990只7日龄体重相近且健康的雄性肉仔鸡(Avian)随机分为11个处理,每个处理6个重复,每个重复15只鸡。