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Commercial Enzymes and Their Influence on Broilers Fed Wheat or Barley

Department of Animal & Poultry Science, University of Guelph, Guelph, ON NIG 2W1, Canada; Phone: (519) 824-4120; FAX: (519) 836-9873

M. M. Kiaei

Faculty of Veterinary Medicine, University of Tehran, P. O. Box 14155-6453, Tehran, Iran

Ray Jones

Hoffman La Roche, 1007 20th Street SE, High River, AB TIV IM7, Canada

Correspondence: S. Leeson, E-mail:SLeeson{at}aps.uoguelph.ca

Two trials attempted to determine the performance of growing broilers fed commercial enzymes added to wheat- and barley-based diets. In the first trial, broilers were fed wheat-based diets and a superior growth rate resulted for all four commercial enzyme treatments (P<. 05) to 35 days. The early improvement in body weight did not continue to 42 days, and overall gain (0 to 42 days) was not different among treatments. Feed utilization was unaffected by enzyme supplementation. A second barley-based trial, with diets formulated to contain ß-glucanase enzymes, resulted in improved bird performance for all enzymes tested to 42 days (P<. 01). Feed utilization was most efficient with Ronozyme B over the experimental period (0 to 42 days). Intestinal viscosity measured in 6-wk-old birds decreased significantly in all birds fed enzymes (P>. 01). In a third experiment, data from mash-fed 2-wk-old birds showed a numerical but nonsignificant lowering of intestinal viscosity. The AME_n of wheat-based diets was not affected by enzyme supplementation.

Key Words: Broilers • enzymes • performance • wheat/barley

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