Effect of supplementation of multiple enzymes to the diets containing variable protein sources on performance and nutrient utilization in commercial broilers

The effect of supplementation of multiple enzymes at 0, 1X, and 2X concentration to the diet containing variable protein sources (replacement of soybean meal with 10% guar meal (GM), 10% rapeseed meal (RSM), and 10% cottonseed meal (CSM)) was studied in a factorial manner on performance, carcass yield, protein, and energy utilization in commercial broiler males. For this purpose, 600-day-old commercial male broiler chicks (Ross) were randomly divided into 12 treatment groups with 10 replications of 5 birds each and reared in battery brooders up to 42 days of age. Treatment groups are as follows: T-1 control and T-2 and T-3 corn-soya diet with enzymes at 1X and 2X concentrations, respectively. From T-4 to T-12 treatments, corn-soya meal was replaced by 10% GM, RSM, and CSM without, with 1X and 2X concentration of enzyme supplementation, respectively. The cumulative body weight gain was significantly (P < 0.05) higher in control and birds fed with GM diet in pre-starter and starter as well as during overall period. Supplementation of multiple enzymes at 1X and 2X did not influence body weight, feed intake, and FCR (P > 0.05) during 0-42 days of age. During experimental period, birds fed with the control diet and 10% GM diet showed significantly (P < 0.05) higher cumulative feed intake and better FCR compared to birds fed with 10% RSM diet and 10% cottonseed meal (CSM). Supplementation of multiple enzymes did not influence the mortality and slaughter variables and protein utilization in broilers.