Re-evaluation of recent research on metabolic utilization of energy in poultry: Recommendations for a net energy system for broilers

Title
Re-evaluation of recent research on metabolic utilization of energy in poultry: Recommendations for a net energy system for broilers
Publication Date
2024-03
Author(s)
Noblet, Jean
Tay-Zar, Aye-Cho
Wu, Shu-biao
( author )
OrcID: https://orcid.org/0000-0002-1790-6015
Email: swu3@une.edu.au
UNE Id une-id:swu3
Srichana, Pairat
Cozannet, Pierre
Geraert, Pierre-André
Choct, Mingan
( author )
OrcID: https://orcid.org/0000-0002-2242-8222
Email: mchoct@une.edu.au
UNE Id une-id:mchoct
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Zhongguo Xumu Shouyi Xuehui,Chinese Association of Animal Science and Veterinary Medicine
Place of publication
China
DOI
10.1016/j.aninu.2023.10.006
UNE publication id
une:1959.11/61038
Abstract

Different energy systems have been proposed for energy evaluation of feeds for domestic animals. The oldest and most commonly used systems take into account the fecal energy loss to obtain digestible energy (DE), and fecal, urinary and fermentation gases energy losses to calculate metabolizable energy (ME). In the case of ruminants and pigs, the net energy (NE) system, which takes into account the heat increment associated with the metabolic utilization of ME, has progressively replaced the DE and ME systems over the last 50 years. For poultry, apparent ME (AME) is used exclusively and NE is not yet used widely. The present paper considers some important methodological points for measuring NE in poultry feeds and summarizes the available knowledge on NE systems for poultry. NE prediction equations based on a common analysis of three recent studies representing a total of 50 complete and balanced diets fed to broilers are proposed; these equations including the AME content and easily available chemical indicators have been validated on another set of 30 diets. The equations are applicable to both ingredients and complete diets. They rely primarily on an accurate and reliable AME value which then represents the first limiting predictor of NE value. Our analysis indicates that NE would be a better predictor of broiler performance than AME and that the hierarchy between feeds is dependent on the energy system with a higher energy value for fat and a lower energy value for protein in an NE system. Practical considerations for implementing such an NE system from the commonly used AME or AMEn (AME adjusted for zero nitrogen balance) systems are presented. In conclusion, there is sufficient information to allow the implementation of the NE concept in order to improve the accuracy of feed formulation in poultry.

Link
Citation
Animal Nutrition, v.16, p. 62-72
ISSN
2405-6383
2405-6545
Start page
62
End page
72
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International

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