Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens
The hypothesis that capping dietary starch:protein ratios would enhance the performance of broiler chickens offered reduced-crude protein (CP) diets was tested in this experiment. A total of 432 off-sex, male Ross 308 chicks were allocated to 7 dietary treatments from 7 to 35 d post-hatch. The exper...
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doaj-cf9f3a352db147dda8bdc64473e7ecd52021-04-02T10:32:23ZengKeAi Communications Co., Ltd.Animal Nutrition2405-65452020-06-0162168178Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickensShiva Greenhalgh0Bernard V. McInerney1Leon R. McQuade2Peter V. Chrystal3Ali Khoddami4Molly A.M. Zhuang5Sonia Y. Liu6Peter H. Selle7Poultry Research Foundation, The University of Sydney, Camden, NSW, AustraliaAustralian Proteome Analysis Facility, Macquarie University, Sydney, NSW, AustraliaAustralian Proteome Analysis Facility, Macquarie University, Sydney, NSW, AustraliaPoultry Research Foundation, The University of Sydney, Camden, NSW, Australia; Baiada Poultry Pty Limited, Pendle Hill, NSW, AustraliaPoultry Research Foundation, The University of Sydney, Camden, NSW, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, Sydney, NSW, AustraliaPoultry Research Foundation, The University of Sydney, Camden, NSW, AustraliaPoultry Research Foundation, The University of Sydney, Camden, NSW, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, Sydney, NSW, AustraliaPoultry Research Foundation, The University of Sydney, Camden, NSW, Australia; Corresponding author.The hypothesis that capping dietary starch:protein ratios would enhance the performance of broiler chickens offered reduced-crude protein (CP) diets was tested in this experiment. A total of 432 off-sex, male Ross 308 chicks were allocated to 7 dietary treatments from 7 to 35 d post-hatch. The experimental design consisted of a 3 × 2 factorial array of treatments with the seventh treatment serving as a positive control. Three levels of dietary CP (197.5, 180.0 and 162.5 g/kg) with either uncapped or capped dietary starch:protein ratios constituted the factorial array of treatments, whilst the positive control diet contained 215.0 g/kg CP. The positive control diet had an analysed dietary starch:protein ratio of 1.50 as opposed to a ratio of 1.68 in the uncapped 197.5 g/kg CP diet and 1.41 in the corresponding capped diet and the capped 197.5 g/kg CP diet displayed promise. The growth performance this diet matched the positive control but outperformed the uncapped 197.5 g/kg CP diet by 10.4% (2,161 vs. 1,958; P = 0.009) in weight gain, by 3.10% (3,492 vs. 3,387; P = 0.019) in feed intake on the basis of pair-wise comparisons and numerically improved FCR by 4.04% (1.616 vs. 1.684). However, the growth performance of birds offered the 180.0 and 162.5 g/kg CP dietary treatments was remarkably inferior, irrespective of dietary starch:protein ratios. This inferior growth performance was associated with poor feathering and even feather-pecking and significant linear relationships between feather scores and parameters of growth performance were observed. The amino acid profile of feathers was determined where cysteine, glutamic acid, glycine, proline and serine were dominant in a crude protein content of 931 g/kg. Presumably, the feathering issues observed were manifestations of amino acid inadequacies or imbalances in the more reduced-CP diets and consideration is given to the implications of these outcomes.http://www.sciencedirect.com/science/article/pii/S2405654520300056Amino acidsBroiler chickenCrude proteinFeatheringStarch:protein ratioWheat |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shiva Greenhalgh Bernard V. McInerney Leon R. McQuade Peter V. Chrystal Ali Khoddami Molly A.M. Zhuang Sonia Y. Liu Peter H. Selle |
spellingShingle |
Shiva Greenhalgh Bernard V. McInerney Leon R. McQuade Peter V. Chrystal Ali Khoddami Molly A.M. Zhuang Sonia Y. Liu Peter H. Selle Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens Animal Nutrition Amino acids Broiler chicken Crude protein Feathering Starch:protein ratio Wheat |
author_facet |
Shiva Greenhalgh Bernard V. McInerney Leon R. McQuade Peter V. Chrystal Ali Khoddami Molly A.M. Zhuang Sonia Y. Liu Peter H. Selle |
author_sort |
Shiva Greenhalgh |
title |
Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
title_short |
Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
title_full |
Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
title_fullStr |
Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
title_full_unstemmed |
Capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
title_sort |
capping dietary starch:protein ratios in moderately reduced crude protein, wheat-based diets showed promise but further reductions generated inferior growth performance in broiler chickens |
publisher |
KeAi Communications Co., Ltd. |
series |
Animal Nutrition |
issn |
2405-6545 |
publishDate |
2020-06-01 |
description |
The hypothesis that capping dietary starch:protein ratios would enhance the performance of broiler chickens offered reduced-crude protein (CP) diets was tested in this experiment. A total of 432 off-sex, male Ross 308 chicks were allocated to 7 dietary treatments from 7 to 35 d post-hatch. The experimental design consisted of a 3 × 2 factorial array of treatments with the seventh treatment serving as a positive control. Three levels of dietary CP (197.5, 180.0 and 162.5 g/kg) with either uncapped or capped dietary starch:protein ratios constituted the factorial array of treatments, whilst the positive control diet contained 215.0 g/kg CP. The positive control diet had an analysed dietary starch:protein ratio of 1.50 as opposed to a ratio of 1.68 in the uncapped 197.5 g/kg CP diet and 1.41 in the corresponding capped diet and the capped 197.5 g/kg CP diet displayed promise. The growth performance this diet matched the positive control but outperformed the uncapped 197.5 g/kg CP diet by 10.4% (2,161 vs. 1,958; P = 0.009) in weight gain, by 3.10% (3,492 vs. 3,387; P = 0.019) in feed intake on the basis of pair-wise comparisons and numerically improved FCR by 4.04% (1.616 vs. 1.684). However, the growth performance of birds offered the 180.0 and 162.5 g/kg CP dietary treatments was remarkably inferior, irrespective of dietary starch:protein ratios. This inferior growth performance was associated with poor feathering and even feather-pecking and significant linear relationships between feather scores and parameters of growth performance were observed. The amino acid profile of feathers was determined where cysteine, glutamic acid, glycine, proline and serine were dominant in a crude protein content of 931 g/kg. Presumably, the feathering issues observed were manifestations of amino acid inadequacies or imbalances in the more reduced-CP diets and consideration is given to the implications of these outcomes. |
topic |
Amino acids Broiler chicken Crude protein Feathering Starch:protein ratio Wheat |
url |
http://www.sciencedirect.com/science/article/pii/S2405654520300056 |
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