Growth performance of the Ross broiler chicks during an 8th week growing period was studied, in the humid tropical environment of Imo State, Nigeria, using growth data derived from 100 broiler chicken, consisting of 57 males and 53 females. Weekly mean body weight of males and females ranged between 44.24 and 1986.36 g and 43.68g and 1648.53 g respectively. The weekly body weight gain ranged between 103.33 and 414.24 g for males and 102.21 and 340.00 g for females. Differences between mean body weight of males and females became significant (p