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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2007 > Volume 6 Number 3 > Daniel Emygdio de Faria Filho1*, Daniel Mendes Borges Campos2, Karoll Andrea Alfonso-Torres2, Bruno Serpa Vieira2, Paulo Sérgio Rosa3, Aiani Maria Vaz2, Marcos Macari2 and Renato Luis Furlan2

Protein Levels for Heat-Exposed Broilers: Performance, Nutrients Digestibility, and Energy and Protein Metabolism

Daniel Emygdio de Faria Filho1*, Daniel Mendes Borges Campos2, Karoll Andrea Alfonso-Torres2, Bruno Serpa Vieira2, Paulo Sérgio Rosa3, Aiani Maria Vaz2, Marcos Macari2 and Renato Luis Furlan2
1Universidade Federal de Minas Gerais - Nْcleo de Ciências Agrلrias - Montes Claros, MG, Brazil 2Universidade Estadual Paulista - Faculdade de Ciências Agrلrias e Veterinلrias - Jaboticabal, SP, Brazil 3Embrapa Suيnos e Aves and Universidade do Contestado - Concَrdia, SC, Brazil
Abstract :

Heat stress causes significant economic losses on broilers production due to poorer performance and carcass quality. Considering that protein has the highest heat increment among nutrients, it has been suggested that protein levels should be reduced in diets for heat-exposed broilers. Nevertheless, there are
no conclusive results on the benefits of such practice, and further studies should be performed to elucidate
some reported discrepancies. Thus, a trial was carried out to evaluate the effects of dietary protein levels (17, 20 and 23%) and environmental temperature (22 and 32؛C) on the performance, nutrients digestibility, and energy and protein metabolism of broiler chickens from 21 to 42 days of age. Nutrients digestibility was determined by total excreta collection, and energy and protein metabolism was evaluated by comparative slaughter method. It was concluded that (1) heat exposure impairs broilers performance and increases nitrogen excretion, but do not change nutrients digestibility; (2) high-protein diets are technically feasible and promotes lower heat production for broilers reared under thermoneutral or hot environments, however, highprotein diets increases nitrogen excretion.

Keywords :
Comparative slaughter, heat stress, ideal protein, nitrogen excretion, total excreta collection

Date Deposited : 14 Jul 2011 12:54

Last Modified : 14 Jul 2011 12:54

Official URL: http://www.pjbs.org/ijps/ijps.htm

Volume 6, Number 3, - 2007 , ISSN 1682-8356

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