material being conveyed to the distal gastrointestinal tract . Previous authors have reported a depressive effect of diets containing elevated cellulose concentrations on digestibility of Nitrogen (Kiarie et al., 2007), of both dietary and endogenous origin (Furuya and Kaji, 1992). Therefore the provision
of purified β-glucans to a wheat-based diet may offer a more efficacious method to beneficially modulate the contents of
the dGIT compared with a barley-based formulation, whereby a fermentable -glucan source may be provided without the
associated implications for a depressed CTTAD of N and potential formation of odorous metabolites