Effect of Phytase Supplementation in Diets on Nutrient Digestibility and Performance in Broiler Chicks

    A performance trial was conducted with broiler chicks to study the effect of phytase (PHY) supplementation in diets formulated with reduced AME, Ca, and P. The nutrient digestibility was determined during the 14- to 21-d and 28- to 35-d periods. The treatments consisted of 3 diets (NC1, NC2, NC3) differing in nutrient content and each diet with or without supplemental PHY (NC1, 0 or 500, NC2, 0 or 750, NC3, 0 or 1,000 U of PHY/kg feed) and 1 positive control diet (PC). Compared with the PC diet, negative control diets (NC) resulted in lower AME and apparent ileal amino acid digestibility for some amino acids. Phytase supplementation of the NC diets increased AME, apparent ileal amino acid digestibility, and apparent ileal crude protein digestibility. Phytase addition also increased mineral absorption in 21- and 35-d-old broilers fed NC diets. Reduced nutrient digestibility appears to be a factor in the weight gain and feed intake results. Reducing Ca and P content reduced feed intake in a stepwise fashion in the NC diets. Phytase increased feed intake and generally improved nutrient digestibility, which resulted in an increase in digestible nutrient intake. Averaged across NC diets, PHY improved body weight. Bone-breaking strength was the most consistent predictor of Ca and P reduction. All NC diets had significantly lower bone-breaking strength than the PC. Phytase supplementation of the NC diets gave bone-breaking strengths that were comparable to the PC. Diets with PHY had the highest bio economic index
    Document information
    Product / service: Phytases
    Publication date: 01/01/2008
    Species: Poultry, Broiler
    Authors: Santos FR, Hruby M, Pierson EEM, Sakomura NK, Remus J
    Doctype: Publications & Citations
    Publication / conference: Journal of Applied Poultry Research, volume 17
    Regions and countries: Global
    Keywords: absorption, ame, amino, acid, digestibility, acids, body, weight, broiler, chick, chicks, broilers, ca, content, control, crude, protein, dan, diet, diets, digestibilities, e, feed, intake, gain, ileal, mineral, n, nutrient, p, performance, phytase, matrix, supplementation, treatment
    Production challenge(s): Gut health
    Diets: All diets
    Brands: Axtra® PHY, Phyzyme® XP, Optimize Feed, Phycheck, FASTKit assay
    Resource ref: 9865
    This material is related to a conference
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