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    The effect of conditioning temperature and exogenous xylanase addition on the viscosity of wheat based diets and the performance of broiler chickens

    1. A total of 1920 Ross broiler chicks were used in a 6 treatment by 8 replicate growth study to investigate the effect of conditioning temperature and exogenous xylanase addition on diet characteristics and bird performance. 2. Increasing conditioning temperature from 80 to 90C increased the viscosity of the diets by approximately 6 mPa.s and reduced body weight gain of the broiler chickens by 7%. 3. Furthermore, there was a significant interaction between temperature and the addition of exogenous xylanase, with a proportionately greater positive response to added xylanase in the diets that were pelleted at higher temperatures. 4. Addition of exogenous xylanase also increased the proportion of soluble arabinoxylan in the feed and reduced dietary viscosity, which is likely to be related to the degree of polymerisation of the soluble carbohydrate. 5. These results suggest that conditioning temperature should be considered as a factor when attempting to predict the response of broilers to added xylanase, especially when high-viscosity or 'low-quality' wheat is being used. 6. It can be concluded that pelleting wheat-based diets above 80C can compromise bird performance and that, if higher temperatures are to be employed, the use of exogenous xylanase is critical to maintain productivity
    Document information
    Product / service: Carbohydrases and Proteases
    Publication date: 01/01/2005
    Species: Poultry, Broiler
    Authors: Cowieson AJ, Hruby M, Faurschou Isaksen M
    Doctype: Publications & Citations
    Publication / conference: British Poultry Science, volume 46
    Regions and countries: Global
    Keywords: arabinoxylan, body, weight, broiler, chick, chicken, chickens, chicks, broilers, carbohydrate, conditioning, dan, diet, dietary, diets, feed, gain, growth, interaction, pelleting, performance, productivity, response, ross, soluble, temperature, treatment, viscosity, wheat, xylanase
    Production challenge(s): Gut health
    Diets: Wheat, Wheat and barley & high fibre by-products, Corn & sorghum meal
    Brands: Axtra® AB, Avizyme® 1200, Avizyme® 1300, Avicheck, Danisco Xylanase
    Resource ref: 8403
    This material is related to a conference
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