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    Age-Related Influence of a Cocktail of Xylanase, Amylase, and Protease or Phytase Individually or in Combination in Broilers

    This 21-d experiment was conducted to determine if the response of chicks to a cocktail of xylanase, amylase, and protease (XAP) or Escherichia coli-derived phytase individually or in combination when fed a nutritionally marginal corn-soybean meal diet is age-dependent. Six hundred 1-d-old chicks were allocated to 5 dietary treatments in a randomized complete block design. The treatments were as follows: 1) positive control with supplemental inorganic P, 2) negative control (NC) marginal in P and ME, 3) NC plus XAP to provide (per kg of diet) 650, 1,650, and 4,000 U of xylanase, amylase, and protease, respectively, 4) NC plus phytase added to provide 1,000 phytase units/kg, and 5) NC plus a combination of XAP and phytase. Low ME and P in the NC diet depressed weight gain and gain: feed (P ??0.001). A cocktail of XAP alone did not improve performance, but phytase supplementation improved (P ??0.001) weight gain. The enzymes were additive in their effects on growth performance. The enzymes had no effect on ileal digestible energy. Ileal N digestibility was higher (P ? 0.05) in diet with XAP or phytase individually compared with NC. Both phytase and XAP individually and in combination improved (P ??0.01) ileal P digestibility compared with NC. Total tract nutrient retention and ME increased (P ??0.01) as the birds grew older. There were age ??diet interactions (P ??0.001) on total tract retention of P and Ca, improvement in P retention due to phytase use decreased by 50% as the chicks matured. The current study shows that a combination of XAP and phytase improved performance, but the enhancement in performance appears to be mainly from phytase. Both XAP and phytase were effective in improving P digestibility and retention of chicks receiving nutritionally marginal corn-soybean meal. The data also shows that the chicks benefited more from the enzyme addition at a younger age and that the contribution of the enzymes to nutrient retention decreased with age in chickens
    Document information
    Product / service: Carbohydrases and Proteases
    Publication date: 01/01/2007
    Species: Poultry, Broiler
    Authors: Olukosi OA, Cowieson AJ, Adeola O
    Doctype: Publications & Citations
    Publication / conference: Poultry Science, volume 86
    Regions and countries: Global
    Keywords: additive, age, amylase, birds, broiler, broilers, ca, chick, chicken, chickens, chicks, combination, control, diet, dietary, digestibilities, digestibility, digestible, energy, effects, enzyme, addition, enzymes, gain, growth, performance, ileal, p, interaction, interactions, me, meal, n, nutrient, retention, p-digestibility, per, phytase, protease, response, supplementation, treatment, weight, xylanase
    Production challenge(s): Gut health
    Diets: Wheat, Wheat and barley & high fibre by-products, Corn & sorghum meal
    Brands: Axtra® AB, Axtra® XAP, Axtra® PHY, Optimize Feed, Phyzyme® XP, Phycheck, Danisco Xylanase, Avizyme® 1200, Avizyme® 1300, Avicheck, Avizyme® 1500, Avicheck Corn, FASTKit assay
    Resource ref: 9030
    This material is related to a conference
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