Interaction (P < 0.05) between diet type and xylanase were observed on CAID of gross energy (GE), insoluble arabinose and xylose (iAX), total arabinose and xylose (tAX),insoluble NSP (iNSP), and total NSP (tNSP). In this context, pigs fed wheat-based diets with xylanase C and D and those fed corn-based diets with xylanases B and E had greater (P < 0.05)CAID of GE compared to those fed xylanase-free diets. The CAID of tAX and tNSP in pigs fed wheat-based diets with xylanase C and corn-based diets with xylanases B and E werehigher (P < 0.001) than in pigs fed the other diets. There was no treatment effects on CATTD of GE, DM and crude protein, however, xylanases independently improved (P = 0.040)