Their specificity requires that dif- ferent enzymes are used to break down each component of the indigesti- ble dietary frac- tion.
NSPs differ, which has a direct impact on the efficacy of enzy- matic degradation. The more NSPs in a diet, the more digesti- bility is affected. There is still much to learn about the impact of indigestible components in many feed ingredients. Understanding the complex nature of the NSP content boosts the potential to improve the digestibility of feed. Not all carbohydrases act in the same way on the NSP components because they are a variable substrate. This is why greater effects are seen by add- ing a combination of carbohydrases to the diet.
The feedase effect Their specificity requires that different enzymes are used to degrade each component of the indigestible dietary fraction. The ability of efficient multi-enzyme solutions to improve global feed digestibility is known as the feedase effect. By breaking down the indigestible fractions of feed and and as- sociated anti-nutritional factors, more nutrients are released. So the mode of action is a synergy between the effects of ara- binofuranosidases (Abf) and xylanases – along with beta-glu- canases and cellulases (Figure 1). Abf, as Feruloyl esterase, are debranching enzymes which, in
28 ▶ POULTRY WORLD | No. 9, 2019
combination with xylanases, are very effective in breaking down highly-branched arabinoxylans. Abf enzymes remove the arabinose residues from the xylose chain. The xylanases then have better access to the xylose backbone for hydrolysis. This synergistic action results in a greater breakdown of arab- inoxylan – reducing its anti-nutritional effects. Therefore re- leasing more nutrients, such as amino acids and lipids. This improves the overall efficacy of feed energy utilisation. An ex- tra quantity of metabolisable energy can then be measured. The feedase effect is therefore also a matter of understanding the combined effect of different enzymes on the same feed, thereby enabling it to release nutrients more efficiently.
Getting more from broiler diets The efficacy of the feedase effect has already been demon- strated in scientific studies and commercial evaluations. Nu- tritionists have found that they get better nutritional efficien- cy by adding an efficacious enzyme complex to a variety of diets. Several studies measured the performance of broilers fed a series of reformulated diets. The addition of a feedase recovered the reduction in FCR seen in the reformulated di- ets. Demonstrating that more nutrients were released from
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