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The influences of floor and cage-rearing on behavioural adaptation to furnished cages were investigated in laying hens. Two groups of 180 Isa Brown commercial layer pullets were reared in cages (CR) or floor pens (FR) and transferred to furnished cages, where their behavioural adaptation was observed throughout the laying period (18-78 wks of age). At 17 weeks of age, hens were placed in one of the 36 furnished cages with 10 birds in each cage, each containing a nest box, perches, a dust bath, and abrasive strips. At 50 and 54 weeks of age, direct visual observation and video recording were used to assess hen’s behaviour. From 21 weeks of age, the dust-bath activities of leg-banded hens in eight cages per treatment were recorded. The amount of time spent walking was higher (3.5% vs. 1.8%) and perching was lower (7.5% vs. 13.4%) in CR hens than in FR hens (P<0.05). The use of dust baths and dust bathing behaviour increased throughout the laying period. The proportion of hens present at the sand bath area increased from 9.2% at 21 weeks to 21.4% at 72 weeks and the proportion of hens dust bathing increased from 4.7% to 21.0% (P<0.05). At 72 weeks of age, all dust-bath parameters were higher (P<0.05) in FR hens than in CR hens. Neste trabalho, foi avaliada a influência dos sistemas de cria (em piso e em baterias) sobre a adaptação comportamental de poedeiras em gaiolas enriquecidas. Dois grupos de 180 frangas Isa brown foram criadas em baterias (CR) ou em piso (FR) e foram transferidas para gaiolas enriquecidas, onde a adaptação comportamental foi observada durante um ciclo completo de postura (18-78 semanas de idade). Com 17 semanas de idade, as frangas foram alojadas em 36 gaiolas enriquecidas, 10 aves por gaiolas, cada uma contendo um ninho, poleiros, banho de areia e lixas de unha. Nas semanas 50 e 54, foi utilizada observação direta e imagens de vídeo para a análise do comportamento. A partir de 21 semanas de idade, a atividade de banho de areia em galinhas marcadas com anilhas foi registrada em 8 gaiolas por tratamento. As aves CR gastaram mais tempo caminhando (3,5% vs. 1,8%,) e menos tempo empoleiradas (7,5% vs. 13,4%), se comparadas com as FR (P<0,05). O número de aves presentes nos banhos de areia aumentou de 9,2% às 21 semanas para 21,4% às 72 semanas de idade, enquanto que a proporção de galinhas realizando o banho aumentou de 4,7% para 21,0% (P<0,05). Com 72 semanas de idade, todos os parâmetros de uso de banho de areia foram maiores (P<0,05) nas FR em comparação com a CR

Rearing system and behavioural adaptation of laying hens to furnished cages