NUTRITION ▶▶▶
More evidence for the feedase effect
A BY MAAMER JLALI, PIERRE COZANNET, MARCIO CECCANTINI AND SOFIA ZENAGUI
rabinoxylan chains, the predominant NSP, are one of the most important anti-nutritional factors found in plant feedstuffs. Breaking down these chains increases both digestible nutrient content
and energy. When the nutrients released by exogenous en- zymes are taken into account and thus the improved digesti- bility that this provides, the nutrient density of broiler diets – and hence cost – can be reduced. New research has demonstrated the feedase effect in broilers fed a low nutrient density diet. Despite a 3% nutrient dilution, due to the action of the feedase the metabolisable energy and digestible ami- no acid content was similar to that of a standard wheat and soya diet.
Anti-nutritional effects of NSP
The mechanism by which NSPs lock-up nutrients making them unavailable to the birds, is complex. By encapsulating
Despite all the technical developments in animal production, ways of getting the most out of feedstuffs are still being investigated. Non-starch polysaccharides (NSPs), which make up 7-19% of the plant-based raw materials in broiler diets, are tricky customers. Finding the right combination of enzyme activities to unlock nutrients from a variety of raw materials is essential. To be able to do this scientists need to understand the complex structures of NSPs.
nutrients or increasing the viscosity of the digesta, soluble and insoluble NSPs inhibit the digestion of starch, amino ac- ids and lipids. These encapsulating properties depend on the quantity and properties of the NSP, however, there are impor- tant differences between the NSPs found in the raw materials. For example, the arabinoxylan structures of corn and wheat
Several studies measured the performance of broilers fed a se- ries of reformu- lated diets. The addition of a feedase recov- ered the reduc- tion in FCR seen in the reformu- lated diets.
▶ POULTRY WORLD | No. 9, 2019 27
PHOTO: MARK PASVEER
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