Effects of enzymes supplementation on digestibility and energy utilizations of broilers diets with different metabolizable energy level

Abstract

In this 3?2 factorial design trial with three different levels of metabolizable energy (13.4, 13.00, 12.6 MJ/kg), with and without exogenous enzymes (nutrition density was reduced by introducing sunflower meal in different percentage to diet (0, 8 ? 16%)), the goal was to investigate the effects of exogenous enzymes Roxazyme G2G (cellulase (endo-1,4-(?-glucanase), ?- glucanase (endo-1,3(4)-?-glucanase) and xylanase (endo-1,4- ? xylanase)) on digestibility and energy utilization. Effects of enzymes were most visible in diet with 13.00 MJ/kg and 12.6 MJ/kg while this effect was unnoticed in the group with 13.4 MJ/kg. Reducing of ME caused the decrease in digestibility and metabolizability (ME/GE). The results suggest that exogenous enzymes, used in this trial, increase digestibility of crude proteins, NDF, hemicelluloses and ash (?<0.05), but the effects were most evident in diets with the reduced level of metabolizable energy.