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The effect of phytase and carbohydrase on ileal amino acid digestibility in monogastric diets: complimentary mode of action?

Published online by Cambridge University Press:  23 December 2009

A.J. COWIESON  and
M.R. BEDFORD
A.J. COWIESON*
Affiliation:
AB Vista Feed Ingredients, Marlborough, Wiltshire, SN8 4AN, United Kingdom
M.R. BEDFORD
Affiliation:
AB Vista Feed Ingredients, Marlborough, Wiltshire, SN8 4AN, United Kingdom
*
Corresponding author: [email protected]
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Abstract

As the simultaneous use of carbohydrases and phytases gains momentum it is imperative that formulators understand the magnitude of additivity of effect to allow for appropriate modification to diet nutrient balance. Though carbohydrases and phytases are often thought of as pronutrients with energy, calcium and phosphorus value, within the scientific literature there are dozens of papers on the effect of these enzymes on ileal amino acid digestibility coefficients. The effect of enzymes on ileal amino acid digestibility is instructive as patterns of response allow speculation as to mode of action and likely additivity of admixtures. A review of the scientific literature has revealed that whilst xylanases and phytases may be considered to be broadly additive in effect, on an individual amino acid basis this effect ranges from sub-additive (e.g. threonine) to synergistic (e.g. arginine). Importantly, the mean response to both xylanase and phytase for ileal amino acid digestibility can be predicted (R2=0.65 and 0.56 respectively) by polynomial equations based only on the nutritional value of the control diet. The fact that control diets with an inherently high digestibility respond poorly to enzymes explains why the use of a second enzyme will likely yield a lesser response when used on top of another, since the former has already improved digestibility characteristics. The implications of these responses, as well as suggested mechanisms of action, are discussed within practical diet formulation constraints.

Keywords

phytatecarbohydraseendogenous lossesamino acidsenergypoultry
Type
Review Article
Information
World's Poultry Science Journal , Volume 65 , Issue 4 , December 2009 , pp. 609 - 624
Copyright
Copyright © World's Poultry Science Association 2009

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