| Summary: | Summary: Four experiments were conducted to study the effect of supplementing different concentrations of xylanase (Xyl) (3,200–24,000 u/kg) and α-amylase (Amy) (300–2,250 u/kg) to corn-soybean meal (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 to birds in 10 pens (6′ × 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 4 experiments indicated that feed intake reduced (8,000 X + 850 A and 16,000X + 1,700 A) feed efficiency (8,000 X + 850 A and 12,800X + 1,200 A) improved with supplementation of enzymes compared with 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 ready-to-cook yield of broilers can be improved with supplementation of Xyl and Amy 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.
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