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Veterinary Record 116:345-347 doi:10.1136/vr.116.13.345
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Cage height preference and use in battery-kept hens

Abstract

Caged hens are shown to have a strong preference for cages which have a large vertical space allowance. When filmed in cages of unrestricted head room, nearly 25 per cent of hens' head movements occurred above 40 cm, which is the proposed CEC recommendation.

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