The effect of different amounts of dietary protein on growth performance and carcass components of Cobb strain broilers

The effect of feeding different protein profiles on growth performance, carcass components and nitrogen content of litter in Cobb 500 broiler strain was evaluated using 800 chicks in a completely randomized design with four treatments, five replicates groups of 40 birds per each treatment. The treatments were consisted of four protein feeding profiles (based on Cobb strain nutrition guide, recommendation by NRC, 90% protein recommended by NRC and phase feeding). The effect of different treatments on body weight gain, feed intake, energy consumption, protein efficiency ratio and carcass components were not significant. The birds were fed based on Cobb strain guide had a better feed conversion ratio (P