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Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

Air Velocity and Exposure Time to Ventilation Affect Body Surface and Rectal Temperature of Broiler Chickens

2000; Elsevier BV; Volume: 9; Issue: 1 Linguagem: Inglês

10.1093/japr/9.1.1

ISSN

1542-6629

Autores

Renato Luís Furlan, Marcos Macari, Euclides Roberto Secato, J. R. Guerreiro, Euclides Braga Malheiros,

Tópico(s)

Animal Behavior and Welfare Studies

Resumo

Increasing air movement over poultry by using fans (ventilation) has become an accepted means of reducing environmental heat stress over the last several years. The purpose of this study was to evaluate the effect of air velocity and exposure time to ventilation on body surface and rectal temperature of broiler chickens. Male broiler chickens aged 36-42 days were placed in individual wire cages and exposed to five different air velocities (5.7, 4.2, 3.1, 2.4, or 1.8 m/sec). Throughout the experiment head, back, leg, and rectal temperatures were monitored every 10 min during a 30-min period for each air velocity. The data showed that exposure time to the wind affected (P<.05) leg and body temperature, with a rapid reduction being observed during the first 10 min. There was a reduction in leg temperature with air velocity of 2 m/sec; however, air velocity lower than 4.5 m/sec was not effective in decreasing head and back temperature. The results suggested that air velocity of 2 m/sec, in air temperature of 29°C, improves heat loss in the birds. The data also indicate that exposure time to ventilation seems to be a critical point in the maintenance of bird thermal homeostasis.

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