Why is the addition of non-starch polysaccharide (NSP) enzymes mandatory when using wheat or barley-based feed formulation for brown layers?

When corn prices spike in Pakistan, feed millers often reformulate layer diets using wheat, broken rice, or barley. While wheat is a good energy and protein source, it contains high levels of soluble Non-Starch Polysaccharides (NSPs), specifically arabinoxylans (pentosans), while barley is rich in beta-glucans. These soluble NSPs are highly viscous. When dissolved in the liquid environment of the small intestine, they form a thick, gelatinous matrix (hydrocolloid). This high digesta viscosity physically traps digestive enzymes (like amylases and proteases) and bile salts, blocking them from interacting with food substrates and reducing starch and protein digestibility. Furthermore, the viscous gel traps water, leading to sticky, wet droppings (wet litter) and high ammonia levels in the shed. To counter this, adding exogenous NSP enzymes (xylanase and beta-glucanase) is mandatory. These enzymes hydrolyze the polymer backbones of the viscous NSPs, instantly dropping digesta viscosity, releasing trapped nutrients, and maintaining dry litter and clean brown eggs. Farmers can study carbohydrate biochemistry in the Poultry Encyclopedia, buy high-potency NSP enzymes on Poultry Plaza, monitor grain prices on Poultry Rates, and list clean eggs on Murghi Mandi.