Studies with sugar beat pulp (SBP) have suggested that high levels (up to 650/kg dry matter (DM)) in the diet may beneficially reduce voluntary intake and live-weight gain (LWG) in pregnant sows. (Brouns, Edwards and English, 1995). Similarly, increasing the ratio of SBP: barley from 0.5:0.5 to 0.8:0.2 in the diet of growing sheep reduced LWG, DMI and apparent rate of ruminal digestion (Rouzbehan, Galbraith, Rooke and Perrott, 1994). The effects recorded have been associated with increases in viscosity of digesta due to the presence of non-starch polysaccharides (NSPs). The objective of this study was to determine whether pre-treatment with enzymes (a) may reduce NSP concentrations, measured by breakdown to reducing sugars, and (b) increase the rate of utilisation of NSP in ruminant diets.