An interaction betweendiet type and xylanase was observed for ADG (P < 0.05) such that pigs fed wheat diets withxylanases A and C and corn diets with xylanases A and D had greater (P = 0.044) ADG thanpigs fed xylanase-free diets or wheat diets with xylanase D or corn diets with xylanases Band C. A main effect of xylanase was observed for G:F in which case xylanase A improvedG:F by 10% (P = 0.010) compared to the control.