Influence of enzyme supplementation of maize-soyabean meal diets on carcase composition, whole-body nutrient accretion and total tract nutrient retention of broilers

    1. Carcase composition, whole body nutrient accretion rates and total tract nutrient retention of broilers in response to supplemental phytase or carbohydrase and protease from 0 to 21 d of age were investigated. 2. A total of 480 broilers were allocated to 4 slaughter groups (SG) of 30, 150, 150 and 150 broilers. Thirty broilers, in 6 replicates of 5 birds, comprised the initial SG killed at d 0, 150 broilers were allocated to each of the d 7, 14 and 21 final SG. Broilers in the final SG were allocated to 5 treatments in a randomised complete block design, each treatment had 6 replicate cages of 5 broilers per replicate cage. 3. The diets were maize-wheat-soybean based and the treatments were: (1) positive control which met NRC (1994) energy and nutrients requirements for broiler, (2) negative control (NC) deficient in metabolisable energy (ME) and P, (3) NC plus phytase added at 1000 FTU/kg, (4) NC plus cocktail of xylanase, amylase and protease (XAP), and (5) NC plus phytase and XAP. 4. Except for ash and Ca, the treatments had no effect on carcase composition. Phytase or XAP individually or combined had variable effects on body nutrient accretion rates at various age periods of the broilers compared with the NC diet. Phytase alone or combined with XAP consistently improved body accretion rates of DM, protein, fat, ash, Ca, and P. 5. Addition of phytase alone or combined with XAP to the NC diet improved total tract N and P retention compared with the NC diet. Cocktail of XAP alone or combined with phytase improved Ca retention. Combination of phytase and XAP improved metabolisable energy (ME) and dry matter retention. 6. Overall, the results showed that the exogenous enzymes used had greater effects on the rates of nutrient accumulation in the carcase rather than on the proportion of nutrients deposited in the carcase
    Document information
    Product / service: Carbohydrases and Proteases
    Publication date: 01/01/2008
    Species: Poultry, Broiler
    Authors: Olukosi OA, Cowieson AJ, Adeola O
    Doctype: Publications & Citations
    Publication / conference: Br Poult Sci, volume 49, issue 4
    Regions and countries: Global
    Keywords: accretion, accumulation, age, amylase, animal, ash, birds, broiler, broilers, ca, retention, cages, carbohydrase, carcase, composition, combination, control, diet, diets, dm, dry, matter, effects, energy, enzyme, supplementation, enzymes, exogenous, fat, me, meal, metabolisable, n, nutrient, nutrients, p, per, phytase, protease, protein, randomised, complete, block, design, requirement, requirements, response, slaughter, treatment, usa, xylanase
    Production challenge(s): Gut health
    Diets: Maize, Mixed grain
    Brands: Axtra® AB, Axtra® XAP, Axtra® PHY, Optimize Feed, Phyzyme® XP, Phycheck, Danisco Xylanase, FASTKit assay
    Resource ref: 10059
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