Amino acid requirements for laying hens: a comprehensive review

Shemil P. Macelline; Mehdi Toghyani; Peter V. Chrystal; Peter H. Selle; Sonia Yun Liu

Poultry Science (May 2021)

Amino acid requirements for laying hens: a comprehensive review

Shemil P. Macelline,
Mehdi Toghyani,
Peter V. Chrystal,
Peter H. Selle,
Sonia Yun Liu

Affiliations

Shemil P. Macelline: Poultry Research Foundation, The University of Sydney, Camden Campus, NSW 2570, Camden, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, NSW 2006, Sydney, Australia
Mehdi Toghyani: Poultry Research Foundation, The University of Sydney, Camden Campus, NSW 2570, Camden, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, NSW 2006, Sydney, Australia
Peter V. Chrystal: Poultry Research Foundation, The University of Sydney, Camden Campus, NSW 2570, Camden, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, NSW 2006, Sydney, Australia; Baiada Poultry Pty Limited, Pendle Hill 2145 NSW, Australia
Peter H. Selle: Poultry Research Foundation, The University of Sydney, Camden Campus, NSW 2570, Camden, Australia; Sydney School of Veterinary Science, The University of Sydney, Sydney NSW 2006, Australia
Sonia Yun Liu: Poultry Research Foundation, The University of Sydney, Camden Campus, NSW 2570, Camden, Australia; School of Life and Environmental Sciences, Faculty of Science, The University of Sydney, NSW 2006, Sydney, Australia; Corresponding author:

Journal volume & issue: Vol. 100, no. 5
p. 101036

Abstract

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The main aim of this review is to consolidate the relevant published data examining amino acid requirements of layer hens and to reach a new set of recommendation based on these data. There are inconsistences in lysine, sulphur-containing amino acids, threonine, tryptophan, branched-chain amino acids, and arginine recommendations in data that have surfaced since 1994. This review finds that breed, age, basal diet composition, and assessment method have contributed toward inconsistencies in amino acid recommendations. Presently, the development of reduced-protein diets for layer hens is receiving increasing attention because of the demand for sustainable production. This involves quite radical changes in diet composition with inclusions of nonbound, essential and nonessential amino acids. Increasing inclusions of nonbound amino acids into layer diets modifies protein digestive dynamics, and it may influence amino acid requirements in layer hens. This review considers present amino acid recommendations for layer hens and proposes refinements that may better serve the needs of the layer industry in the future.

Published in Poultry Science

ISSN: 0032-5791 (Print); 1525-3171 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Agriculture: Animal culture
Website: https://www.journals.elsevier.com/poultry-science

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