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Published online by Cambridge University Press:  08 March 2007

Paul Trayhurn ,
P. C. M. Simons ,
H. A. J. Versteegh ,
A. W. Jongbloed ,
P. A. Kemme ,
P. Slump ,
K. D. Bos ,
M. G. E. Wolters ,
R. F. Beudeker  and
G. J. Verschoor
Paul Trayhurn
Affiliation:
Editor-in-Chief
P. C. M. Simons
Affiliation:
Spelderholt Centre for Poultry Research and Information Services, Spelderholt 9, 7361 DA Beekbergen, The Netherlands
H. A. J. Versteegh
Affiliation:
Spelderholt Centre for Poultry Research and Information Services, Spelderholt 9, 7361 DA Beekbergen, The Netherlands
A. W. Jongbloed
Affiliation:
Research Institute for Livestock Feeding and Nutrition, PO Box 160, AD Lelystad, The Netherlands
P. A. Kemme
Affiliation:
Research Institute for Livestock Feeding and Nutrition, PO Box 160, AD Lelystad, The Netherlands
P. Slump
Affiliation:
TNO CIVO-Institutes, PO Box 360, 3700 AJ Zeist, The Netherlands
K. D. Bos
Affiliation:
TNO CIVO-Institutes, PO Box 360, 3700 AJ Zeist, The Netherlands
M. G. E. Wolters
Affiliation:
TNO CIVO-Institutes, PO Box 360, 3700 AJ Zeist, The Netherlands
R. F. Beudeker
Affiliation:
Gist-brocades, PO Box 1, 2600 MA Delft, The Netherlands
G. J. Verschoor
Affiliation:
Gist-brocades, PO Box 1, 2600 MA Delft, The Netherlands
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Abstract

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Techniques have been developed to produce microbial phytase for addition to diets for simple-stomached animals, with the aim to improve phosphorus availability from phytate-P in plant sources. The activityof the crude microbial phytase showed pH optima at pH 5-5 and 2·5. The enzyme was able to degradephytate in vitro in soya-bean meal, maize and a liquid compound feed for pigs. When microbial phytasewas added to low-P diets for broilers the availability of P increased to over 60 % and the amount of Pin the droppings decreased by 50%. The growth rate and feed conversion ratio on the low-P dietscontaining microbial phytase were comparable to or even better than those obtained on control diets.Addition of microbial phytase to diets for growing pigs increased the apparent absorbability of P by24%. The amount of P in the faeces was 35% lower.

Keywords

Phosphorus availabilityMicrobial phytaseBroilersPigs
Type
Other
Information
British Journal of Nutrition , Volume 93 , Issue 1 , January 2005 , pp. 136 - 152
Copyright
Copyright © The Nutrition Society 2005

References

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