Cage height preference and use in battery-kept hens.
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.
D000818:Animals; D002645:Chickens / Q000502:physiology*; D005062:European Union; D005260:Female; D006799:Housing, Animal / Q000592:standards*; D013037:Spatial Behavior