The influence of 2 enzyme supplements for diets based on wheat with high or low viscosity on performance and some intestinal parameters of male broiler chickens were investigated. The experiment was of 2 x 3 factorial design, with 2 types of wheat (high or low viscosity) and 3 enzyme treatments (none, Avizyme 1300-xylanase or Avizyme 1 500-amylase). Heal digesta viscosity was significantly (P < 0.029) higher in birds fed with high viscous wheat than with low viscous wheat.