The objective of this work was to determine crude protein levels on diet of males and females broilers from 22 to 42 days of age. Males (440) and females (440) broilers chickens Hubbard were distributed in a completely randomized design, in order to study five crude protein levels (15%, 17%, 19%, 21% and 23%) in a factorial arrangement. For male broilers, the protein levels had a quadratic effect on weight gain and feed:gain ratio. For females, the effect of protein levels was quadratic on weight gain and linear on feed:gain ratio. The dietary protein levels affected linearly the yield carcass for both sex. The females had higher abdominal fat and breast percentage than the males. The protein level recommended for male broilers is 21.70% and for females is 19.00%.
broiler chickens; dietary crude protein levels; performance
