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Title: Dietary factors influencing performance of broiler chicks offered phytase-supplemented diets
Contributor(s): Moss, A F  (author)orcid ; Chrystal, P V (author); Liu, S Y (author); Selle, P H (author)
Publication Date: 2017-10-03
DOI: 10.1071/ANv57n11abstracts
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Field of Research (FoR) 2008: 070204 Animal Nutrition
070202 Animal Growth and Development
Field of Research (FoR) 2020: 300303 Animal nutrition
300301 Animal growth and development
Socio-Economic Objective (SEO) 2008: 830309 Poultry
Socio-Economic Objective (SEO) 2020: 100411 Poultry
Abstract: Multiple factors may influence responses to phytase inclusion in broiler diets; therefore, a Plackett and Burman (1946) factorial design was used to identify the influential factors (Table 1). Eleven variables were screened over 12 treatments (six replicate cages of six birds per treatment) at two levels. Broiler chicks were offered steam-pelleted diets based on maize or wheat and soybean meal with 1000 FTU/kg exogenous phytase from 7-28 days post-hatch and their growth performance met 2014 Ross 308 objectives. Outcomes are shown in Table 2 (significance was declared at P < 0.10). High levels of Ca (P < 0.0001), canola meal (P < 0.0001) and a xylanase and β-glucanase cocktail (P < 0.10) negatively influenced weight gain, whereas higher levels of digestible lysine (P < 0.0001), xylanase (P < 0.003), available P (P < 0.04) and wheat as the feed grain (P < 0.06) positively influenced weight gain. High levels of Ca (P < 0.05), canola meal (P < 0.02) and available P (P < 0.1) negatively influenced gain-to-feed ratio whereas high digestible lysine (P < 0.0001) positively influenced gain-to-feed ratio. Given the responses to digestible lysine, one possible implication is that phytase supplementation will be effective in low crude protein diets with less ‘intact protein’ and high crystalline amino acid contents. It is noteworthy that xylanase inclusion per se amplified phytase response in diets that were based on both maize and wheat. Contrary to expectations, phytate-P did not significantly influence performance.
Publication Type: Conference Publication
Conference Details: Recent Advances in Animal Nutrition25-27/10/2017
Source of Publication: Animal Production Science, 57(11), p. v-vi
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1836-0939
Peer Reviewed: Yes
HERDC Category Description: E3 Extract of Scholarly Conference Publication
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Appears in Collections:Conference Publication
School of Environmental and Rural Science

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