The Effect of a Commercial Enzyme Preparation on Apparent Metabolizable Energy, the True Ileal Amino Acid Digestibility, and Endogenous Ileal Lysine Losses in Broiler Chickens

ABSTRACT The effect of a commercial enzyme prepa-ration containing xylanase, α-amylase, and β-glucanase on dietary AME content and the apparent and true ileal amino acid digestibility of a corn-soy broiler diet and endogenous ileal lysine flow was determined. Two pre-dominantly corn-soy diets also containing wheat bran and canola meal were formulated; one diet contained no added enzymes, whereas the other was supplemented with α-amylase, β-glucanase, and xylanase. Titanium dioxide was included as an indigestible marker. The diets were given to broiler chickens, and AME and true ileal amino acid digestibility were determined. Portions of the 2 test diets were guanidinated and fed to similar aged broiler chickens and endogenous lysine flows de-termined. The chickens appeared healthy throughout the study, and the mean bird weights at the time o