Effect of supplementation of graded concentrations of xylanase and α-amylase on performance, slaughter variables and energy digestibility in broiler chicken fed corn-soybean meal based diet

Summary Four experiments were conducted to study the effect of supplementing different concentrations of () xylanase (Xyl) (3200 to 24000 u/kg) and α-amylase (Amy) (300 to 2250 u/kg) to corn - SBM based diets on performance, carcass variables and apparent ileal digestibility of energy (AIDE) in broiler chicken. Corn - SBM based diet without the enzymes was kept as the control. Each diet was fed ad libitum from day 1 to 42 days to birds in 10 pens (6’ x 4’5’’), each containing 25 broiler male chicks. The carcass variables and AIDE were studied in experiment IV. The meta analysis on performance data of four experiments indicated that FI reduced (8000 X+850 A and 16000X+1700A) feed efficiency (8000 X+850 A and 12800X+1200A) improved with supplementation of enzymes compared to the control group fed without the enzymes. The magnitude of response in performance variables was dependent on the dose of the enzymes. Enzymes supplementation quadratically improved the ready to cook yield and apparent ileal digestibility of energy. Based on the results, it is concluded that the performance and RTC of broilers can be improved with supplementation of xylanase and α-amylase in broilers fed corn - SBM based diets. The improvement in broiler performance could partly be due to improvement in the apparent ileal digestibility of energy with supplemental enzymes.