Inclusion of xylanase in the diet can break down NSP in cDDGS and consequently improve utilisation of diet components.
In the present study, the digestibility of hemicellulose and energy increased by 20% and 620 kJ/kg, respectively. These
were similar to reports that diets rich in NSP, supplemented with NSP-hydrolyzing enzymes, improved the digestibility of
DM and apparent MEn in poultry (Pan et al., 1998; Lázaro et al., 2003; S´wia˛ tkiewicz and Koreleski, 2007). However, Min
et al. (2009) reported no significant improvement in energy digestibility from adding 1–4 times the recommended level
of two commercial enzyme products for growing broilers fed corn-based diets containing 300 g/kg cDDGS. In the present
study, the largest effect of xylanase on the growth and digestibility response was obtained at a dose of 2400 U/kg in both
basal diets, indicating that such a dose of this particular xylanase may be adequate for the levels of cDDGS added in this
trial