The study was performed to evaluate the effects of enzyme supplementation on performance and digestive parameters of broilers fed corn-soybean diets from 1 to 21 d of age. A total of 480 one-day-old Cobb broilers were allocated to 1 of 4 treatments, with 6 replicate pens per treatment and 20 birds per pen. The experiment consisted of a 2 × 2 factorial arrangement of treatments with 2 dietary ME levels (high ME, energy 1, 12.13 MJ/kg or low ME, energy 2, 11.92 MJ/kg) and 2 levels of supplemental enzyme (including xylanase, 1,800 IU/g, β-glucan...
