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Functional Additives
Monday, October 02, 2006 3:26:29 PM
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Bacterial endo-xylanase: the all round feed enzyme
 
Ronny Mombaerts & Barbara Gaethofs
 

 

Arabinoxylans are the major component of non starch polysaccharides in feed ingredients.  They can be subdivided into water-extractable (WE-AX) and a water-unextractable (WU-AX).  Both types contribute to the anti-nutritional effect: WE-AX increase the intestinal viscosity and WU-AX enclose digestible nutrients. 

 

Arabinoxylans are enzymatic degraded by endo-xylanase.  There seem to be large differences between commercial endo-xylanase preparation, in their selectivity towards the water-extractable and the water-unextractable fractions, leading to differences in application and efficacy. 

 

The importance of water-unextractable arabinoxylans in animal feed is largely underestimated.  They are abundantly present in animal feeds based on wheat, rye, but also corn and barley.  A bacterial endo-xylanase (Nutrase Xyla) has a selective preference towards the WU-AX, liberating entrapped nutrients, and improving performance in a whole array of feed compositions, used in young and older animals, that are considered to be less sensitive to increased intestinal viscosity. 

 
 

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Article made possible through the contribution of Nutrex

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