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Effectiveness of exogenous microbial phytase in improving the bioavailabilities of phosphorus and other nutrients in maize-soya-bean meal diets for broilers

Published online by Cambridge University Press:  18 August 2016

B. J. Camden ,
P.C.H. Morel ,
D. V. Thomas ,
V. Ravindran  and
M. R. Bedford
B. J. Camden
Affiliation:
Monogastric Research Centre, Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
P.C.H. Morel
Affiliation:
Monogastric Research Centre, Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
D. V. Thomas
Affiliation:
Monogastric Research Centre, Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
V. Ravindran*
Affiliation:
Monogastric Research Centre, Institute of Food, Nutrition and Human Health, Massey University, Palmerston North, New Zealand
M. R. Bedford
Affiliation:
Finnfeeds International Ltd, Marlborough, Wiltshire SN8 1XN, UK
*
†Corresponding author. E-mail:V.Ravindran@massey.ac.nz
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Abstract

A 3-week feeding trial using 300 1-day-old male broiler chicks was conducted to evaluate the effects of adding three levels of a microbial phytase (Finnfeed phytase; 250, 500 and 1000 U per kg diet) to a maize-soya-bean-meal diet containing 3·0 g/kg non-phytate phosphorus and 8·0 g/kg calcium. A diet containing 4·0 g/kg non-phytate phosphorus and 9·0 g/kg calcium served as the positive control. The responses were evaluated in terms of broiler performance, toe ash contents, ileal phytate degradation, ileal digestibility of nitrogen, amino acids, phosphorus, starch and fat, apparent metabolizable energy, apparent ileal digestible energy, and apparent retention of phosphorus and nitrogen. The addition of 500 U phytase per kg diet to the phosphorus-deficient maize-soya-bean-meal diet improved the performance and toe ash contents of broilers to equal those given the positive control diet. Ileal phytate degradation data provided direct evidence to the efficacy of phytase in hydrolysing the phytic acid. Addition of 500 U phytase per kg to the maize-soya-bean-meal diet which contained 3·0 g phytate-phosphorus per kg resulted in more than doubling of phytate degradation from 0·218 to 0·481. Supplemental phytase improved ileal digestibility of nitrogen, amino acids, starch and lipids, with these improvements being eventually reflected in enhancements in ileal digestible energy and apparent metabolizable energy.

Keywords

broilersnutrition physiologyperformancephytase
Type
Non-ruminant, nutrition, behaviour and production
Information
Animal Science , Volume 73 , Issue 2 , October 2001 , pp. 289 - 297
Copyright
Copyright © British Society of Animal Science 2001

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