Comparison of enzymatic hydrolysis effects of Trichoderma derived xylanase EX2 on different feed ingredients. It was determined by the release of reducing sugars (RS) and the improvement of in vitro dry matter digestibility (IVDMD). (A,B) Corn–soybean meal basal substrates mixed with 5% DDGS; (C,D) unitary corn hull (CH) substrate; (E,F) unitary wheat bran (WB) substrate; (G,H) comparison of the net increase in RS release (ΔRS, mg/g) and dry matter digestibility (ΔIVDMD, %), respectively. Polylines directly explain the actual variability of each indicator. The dark brown curves in the scatter plot display the RS trend, while the light blue represents the fit of IVDMD. The data are expressed as the means ± SD. The asterisk (*) in this Figure 2B indicates that the corresponding response index values of the enzyme treatment groups are significantly different from the blank control (CON).