Influence of Dietary Phytic Acid and Source of Microbial Phytase on Ileal Endogenous Amino Acid Flows in Broiler Chickens

    The effects of phytic acid and 2 sources of exogenous phytase (bacterial vs. fungal) on the flow of endogenous amino acids at the terminal ileum of broilers were assessed using the enzyme-hydrolyzed casein method. Phytic acid (as the sodium salt) was included in a purified diet at 8.5 and 14.5 g/kg, and each diet was fed without or with a fungal (Aspergillus niger derived) or a bacterial (Escherichia coli-derived) microbial phytase at 500 phytase units/kg of diet. Increasing the concentration of phytic acid in the diet from 8.5 to 14.5 g/kg increased (P < 0.001) the flow of all measured amino acids by an average of 68%, with a range from 17% for proline to 145% for phenylalanine. The flow of endogenous aspartic acid, serine, glutamic acid, glycine, leucine, tyrosine, phenylalanine, and histidine were increased by more than the mean, indicating changes in the composition of endogenous protein in response to the presence of higher concentrations of phytic acid. Supplementation of both phytases reduced (P < 0.001) the flow of endogenous amino acids, but the reduction (P = 0.06) was greater for the bacterial phytase compared with the fungal phytase. These data suggest that a substantial part of the amino acid and energy responses observed following phytase supplementation in broiler chickens stems from reduced endogenous amino acid flows and that the capacity of different phytases to counteract the antinutritive properties of phytic acid vary
    Document information
    Product / service: Phytases
    Publication date: 01/01/2008
    Species: Poultry, Broiler
    Authors: Cowieson AJ, Ravindran V, Selle PH
    Doctype: Publications & Citations
    Publication / conference: Poultry Science, volume 87
    Regions and countries: Global
    Keywords: amino, acid, acids, antinutritive, aspartic, aspergillus, bacterial, broiler, chicken, chickens, broilers, capacity, casein, composition, concentration, dan, diet, dietary, effects, endogenous, protein, energy, fungal, glutamic, glycine, histidine, ileal, ileum, leucine, method, microbial, phytase, p, phenylalanine, phytases, phytic, proline, purified, response, salt, serine, sodium, source, supplementation, tyrosine
    Production challenge(s): Gut health
    Diets: All diets
    Brands: Axtra® PHY, Phyzyme® XP, Optimize Feed, Phycheck, FASTKit assay
    Resource ref: 10078
    This material is related to a conference
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