| The objective of this study was to evaluate the carcass yield of broilers fed diets containing different levels of energy and digestible lysine in the growth phase from 21 to 42 days old. We used 768 male Cobb broilers, 21 days old, divided in a completely randomized design containing 16 treatments (four lysine levels x four energy levels), three replicates of 16 birds each. The lysine levels were 0.9, 1.0, 1.1 and 1.2%, and the energy levels were 2800, 2950, 3100 and 3250 kcal kg-1. The different levels of digestible lysine increased linearly (P <0.05) carcass yield of broilers at 42 days, while the metabolizable energy level had no effect (P> 0.05) on this variable. There was no interaction between levels studied on the yield of breast, thigh and... |
