Abstract
Most of the anti-nutritive activities of non-starch polysaccharides (NSP), which affect broiler performance have been attributed to soluble polysaccharides (Saki, 2005). Most of polysaccharides give viscous aqueous solutions (Bach, 2001). Barley contains substantial amounts of both soluble and insoluble NSP. The main water soluble NSP in barley are highly viscous ?-glucans, composed of ?-(1-4) linked glucose units separated every two to three units by a single ?-(1-3) linked glucose and referred as to a mixed linkage ?-glucan. Not only the amount but also the molecular mass and structure of the ?-glucans influence the viscosity of aqueous solutions (Bengtsson et al., 1990). The study had in view the effect of the extraction conditions and the soluble NSP concentration of the barley water extracts on the relative viscosity (RV). Samples of forage mixtures with different structure (E1 and E2) and barley proportions were milled by a laboratory grinder at a 600 ?m sieve.
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