Improvement of phosphorus availability by microbial phytase in broilers and pigs

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, G.J. Verschoor

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    Abstract

    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.
    Original languageEnglish
    Pages (from-to)137-152
    JournalBritish Journal of Nutrition
    Volume93
    Issue number1
    DOIs
    Publication statusPublished - 2005

    Keywords

    • phytic acid
    • alpha-amylase

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