Synergistic effect of cellulase and hemicellulase on nutrient utilization and performance in broilers fed a corn-soybean meal diet.

摘要

Synergistic effects of dietary cellulase and hemicellulase on nutrient utilization, performance and digesta (content of jejunum) viscosity in male Cobb chickens fed a corn-soybean meal diet were studied. Chickens were divided among control, cellulase (0.33 U/g feed), hemicellulase (2 U/g feed) and mixed enzyme (cellulase (0.33 U/g feed) + hemicellulase (2 U/g feed)) groups. The enzymes were mixed with the basal diet (21.1% crude protein, 3000 kcal/kg metabolizable energy) and fed for 12 days from 15 days of age. Feed and water were offered ad libitum. Chickens were raised at 25degC in wire-bottomed cages for the entire experimental period. Those given enzymes grew faster, and the mixed enzyme was the most effective treatment. Feed intake remained the same for all treatment groups. Carcass wt. was increased markedly by mixed enzyme, but not by cellulase and hemicellulase. The individual enzymes, but not the mixed preparation, reduced abdominal fat; an effect that was significant in the case of cellulase. Enzymes did not affect meat wt. or N-retention, but the metabolizable energy content of the diet was improved by the mixed enzyme. Ash-retention was increased by hemicellulase and the mixed enzyme. Digesta viscosity was significantly decreased by cellulase, but not by hemicellulase or the mixed enzyme. Results indicate that a combination of cellulase and hemicellulase may have synergistic effects on the performance of chickens fed a corn-soybean meal diet.