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Reducing pre-slaughter losses of broilers: crating density effects under different lairage periods at slaughterhouse

DOI: http://dx.doi.org/10.14269/2318-1265.v01n01a01

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Frederico M. C. Vieira1, Iran J. O. Silva2, José A. D. Barbosa Filho3 & Afrânio M. C. Vieira4

 

Abstract: The aim of this work was to assess the effects of densities per crate on mortality rates of broilers during pre-slaughter operations, under different lairage time intervals. Pre-slaughter data from 13,937 broiler flocks were recorded daily during 2006, in a commercial slaughterhouse in southeastern Brazil. The main factors which influenced mortality rates were assessed, such as density per crate, daily periods and lairage time in an environmental controlled lairage. For densities above seven birds per crate, an increase in mortality rates was verified mainly in the warm periods. During the night period, the highest incidence of death losses was noticed when the density was below six birds. Considered a controlled environment, the desirable lairage time for death reduction before arrival at the slaughterhouse was above three hours for higher densities and below one hour for densities below seven birds per crate.

Key words: biometeorology, mortality, broiler chicken, pre-slaughter operation, lairage

 

Resumo: O objetivo deste trabalho foi avaliar os efeitos da densidade de aves por caixa na mortalidade de frangos de corte durante as operações pré-abate, em diferentes intervalos de tempo de espera. Dados referentes às operações pré-abate de 13.937 frangos foram registrados diariamente durante 2006, em um abatedouro comercial de frangos de corte no sudeste do Brasil. Os principais fatores que influenciaram a mortalidade dos animais foram avaliados, tais como a densidade de aves por caixa, períodos do dia e tempo de espera em galpão climatizado. Para densidades acima de sete aves por caixa, foi verificado aumento na mortalidade, principalmente durante os períodos mais quentes. Durante a noite, a maior incidência de mortes antes da chegada à linha de abate foi observada quando a densidade esteve abaixo de seis aves por caixa. Considerando um ambiente controlado, o melhor tempo de espera visando redução de perdas por mortalidade antes da chegada ao abatedouro foi abaixo de três horas para densidades elevadas e abaixo de uma hora para densidades abaixo de sete aves por caixa.

Palavras-chave: biometeorologia, mortalidade, avicultura de corte, operações pré-abate, espera pré-abate

 

1 Federal University of Technology – Paraná (UTFPR), Campus Dois Vizinhos. Estrada para Boa Esperança, km 04, Comunidade São Cristóvão, 85660-000, Dois Vizinhos, Paraná, Brazil, email: fredericovieira@utfpr.edu.br
2 Animal Environment Research Nucleus, Department of Biosystems Engineering, University of São Paulo, Avenida Pádua Dias, 11, PO Box 9, 13418-900 Piracicaba, Brazil
3 Department of Agricultural Engineering, Federal University of Ceará, 60450-760 Fortaleza, Brazil
4 Department of Statistics, University of Brasília, 70910-900 Brasília, Brazil

 

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