Although there is a wide range of anti-nutritional compounds present in various feed ingredients including cereals, the major group is the non-starch polysaccharides (NSP). Common properties of the different NSP are their resistance to the animal’s digestive enzymes and their tendency to create a viscous environment within the intestinal lumen. NSP decrease digesta passage rate and availability of nutrients, while increased digesta retention time facilitates bacterial colonisation and activity in the small intestine.