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RESEARCH ARTICLE

Steam-pelleting and feed form of broiler diets based on three coarsely ground sorghums influences growth performance,nutrient utilisation, starch and nitrogen digestibility

P. H. Selle A C , S. Y. Liu A , J. Cai B and A. J. Cowieson A
+ Author Affiliations
- Author Affiliations

A Poultry Research Foundation within The University of Sydney, 425 Werombi Road, Camden, NSW 2570, Australia.

B Faculty of Agriculture and Environment, The University of Sydney, NSW 2006, Australia.

C Corresponding author. Email: peter.selle@sydney.edu.au

Animal Production Science 52(9) 842-852 https://doi.org/10.1071/AN12026
Submitted: 17 January 2012  Accepted: 4 March 2012   Published: 3 July 2012

Abstract

Sorghum grains with red, white and yellow seed colours were coarsely ground and incorporated into nutritionally equivalent diets that were offered to broiler chicks in three feed forms. The diets were fed as mash or steam-pelleted at a conditioning temperature of 90°C and fed as intact pellets or ground back into mash as reground pellets. The effects of a 3 × 3 factorial array of dietary treatments offered to male chicks from 6 to 27 days post-hatch on growth performance, nutrient utilisation and apparent digestibility coefficients of starch and nitrogen (N) at the proximal jejunum, proximal ileum and distal ileum were determined. Feed form had a greater impact on the parameters assessed than did sorghum seed colour, but several interactions between these main effects were observed. Steam-pelleting diets reduced protein solubility and this was correlated with increased concentrations of disulfide bonds and decreased concentrations of free sulphydryl groups. Steam-pelleting diets significantly depressed N retention in broiler chicks and this reduction was appropriately correlated with concentrations of disulfide bonds and free sulphydryl groups and dietary protein solubility. While N retention was depressed, in a curious outcome, steam-pelleting diets did not compromise N digestibility along the small intestine. Steam-pelleting diets significantly increased starch digestibility coefficients in the proximal jejunum, with differing responses among the sorghums, but not in the two ileal levels. Phytate concentrations in the three sorghums were negatively correlated with N digestibility coefficients at the proximal jejunum and proximal ileum. The implications of the present feeding study in relation to the performance of broiler chickens offered steam-pelleted, sorghum-based diets are discussed.

Additional keywords: conditioning temperatures, disulfide bonds, free sulphydryl groups, gizzard weight, kafirin, particle size, phytate, seed colours.


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