Addition of sodium metabisulfite and microbial phytase, individually and in combination, to a sorghum-based diet for broiler chickens from 7 to 28 days post-hatch
H. H. Truong A B , D. J. Cadogan C , S. Y. Liu A and P. H. Selle A DA Poultry Research Foundation within The Faculty of Veterinary Science, The University of Sydney, 425 Werombi Road, Camden, NSW 2570, Australia.
B Poultry CRC, University of New England, Armidale, NSW 2351, Australia.
C Feedworks, Lancefield, Vic. 3435, Australia.
D Corresponding author. Email: peter.selle@sydney.edu.au
Animal Production Science 56(9) 1484-1491 https://doi.org/10.1071/AN14841
Submitted: 30 September 2014 Accepted: 20 January 2015 Published: 30 April 2015
Journal Compilation © CSIRO Publishing 2016 Open Access CC BY-NC-ND
Abstract
Sodium metabisulfite (SMBS; 1.75 g/kg) and phytase (1000 FTU/kg), individually and in combination, were included in steam-pelleted, sorghum-based (580 g/kg) broiler diets from 7 to 28 days post-hatch. Rapid visco-analysis starch pasting properties of dietary treatments were monitored. Parameters of growth performance, nutrient utilisation, relative organ weights, toe ash, excreta moisture, apparent starch and nitrogen digestibility coefficients and disappearance rates in four small intestinal segments were determined. There were significant treatment interactions in the proximal jejunum (P < 0.01) and distal ileum (P < 0.05) for nitrogen digestibility coefficients. SMBS alone significantly increased jejunal nitrogen digestibility by 14.9% (0.634 vs 0.552) but the response to SMBS in combination with phytase was negligible (0.558 vs 0.552). SMBS alone significantly increased ileal nitrogen digestibility by 4.92% (0.786 vs 0.732) but the combination numerically improved digestibility by 0.96% (0.739 vs 0.732). SMBS alone tended to increase starch digestibility by 12.0% (0.691 vs 0.617; P = 0.064) in the proximal jejunum and increased rapidly digestible starch by 17.2% (116 vs 99 g/bird.day; P < 0.02). However, SMBS tended to depress apparent metabolisable energy by 0.33 MJ (P < 0.10). Therefore, consideration is given to the mechanisms influencing starch digestion rates, energy utilisation and nitrogen digestibility interactions between SMBS and phytase in this feeding study.
Additional keywords: dilated proventriculi, disulfide cross-linkages, kafirin, RVA starch pasting properties, slowly digestible starch.
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