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Brazilian Journal of Poultry Science

Print version ISSN 1516-635X


ALVES, FMS et al. Impact of exposure to cold on layer production. Rev. Bras. Cienc. Avic. [online]. 2012, vol.14, n.3, pp.223-226. ISSN 1516-635X.

Infrared thermographic images were used to evaluate the effect of the exposure of layers to cold. In this trial, 540 Isa Brown® layers with an average age of 69 weeks were housed in a conventional layer house typically used in Brazil during a period of cold environmental temperatures. Environmental and heat-transference data were recorded between July 13-16, 2010. It was verified that layers under cold stress conditions lost four times more energy that the recommendations trying to maintain their body temperature. Due to their reduced feed intake capacity, hens are not capable of increasing the availability of the metabolic energy required to maintain their body temperature and egg production, consequently resulting in economic losses.

Keywords : Infrared image; housing environment; heat exchange; economic evaluation; egg production.

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