The aim of study was to evaluate the use of different levels of NSP degrading blend of enzymes (β-xylanase and β-glucanase) in practical wheat/barley-based diets for growing turkeys. The growth performance, as well as intestinal metabolism indicators of BIG-6 female turkeys was measured during the 8 weeks of experimental feeding. Turkeys were fed diets without enzyme supplementation (control group) or diets supplemented with enzyme preparation applied at doses of 50 (low), 100 (medium) and 150 mg/kg diet (high). The feed enzyme preparation contained a blend of xylanase (210 000 U/g) and β-glucanase (130 000 U/g of product). In the growth trial, enzyme supplementation did not significantly affect the body weight of the turkeys. The highest dose (150 mg/kg) of enzyme preparation decreased (p≤0.05) ileal viscosity (2.42 vs. 2.66 mPa.s), caecal viscosity (9.12 vs. 11.36 mPa.s), and weight of small intestinal tissue (10.6 vs. 13.4 g/kg BW) and feed conversion ratio of trial turkeys (by 3.5%) in comparison with the control animals. Enzyme supplementation also caused a visible growth tendency in total VFA in the caecal digesta of the turkeys. The proportions of major fatty acids also changed compared with the control group and the production of acetic acid increased, whereas the production of propionic acid decreased. No enzyme addition response was observed for lactic acid bacteria, Enterobacteriaceae, Escherichia coli or Clostridium perfringens rods in caecal digesta of turkeys, but the aerobic spore forming bacteria count decreased (p≤0.05). The best performance and physiological response of turkeys was obtained after applying the highest proportion (150 mg/kg) of enzyme preparation to the diet.
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