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Behavior. --- Chicken. --- Density. --- Fear. --- Group size. --- Group. --- Hen. --- Housing. --- Management. --- Production. --- Productivity. --- Size.

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Behavior. --- Environment. --- Environments. --- Field. --- Group size. --- Group. --- Horse. --- Horses. --- Size. --- Yearling horses.

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Avoidance. --- Behavior. --- Cage. --- Density. --- Escape. --- Feather-pecking. --- Genetic. --- Group size. --- Group. --- Hen. --- Production. --- Size.

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Aggression. --- Group size. --- Group. --- Laboratory mice. --- Laboratory. --- Lesions. --- Level. --- Male. --- Mice. --- Size. --- Space allowance. --- Space.

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Ninety, 30-day-old rabbits were housed in identical cages in groups of six, seven, eight and nine animals, corresponding to stocking densities of 15.3, 17.8, 20.4 and 23 rabbits m(-2). Behaviour was recorded by video camera at 6 and 10 weeks of age, during 24 h observations consisting of 96 sequences of 1 min every 15 min. At 6 weeks of age, animals spent 60% of their time at rest, 15% in feeding activities and 25% in other activities without marked influence of group size or stocking densities. At 10 weeks of age, a slight but significant increase of resting and a reduction of overall activities was observed in rabbits housed at the highest density. Comfort behaviour (self-directed activities) was dominant (18-20% of activities other than maintenance); other consistent activities were investigatory, social and locomotory behaviours. Sexual and stereotypic behaviours were not observed in these animals slaughtered at 10 weeks of age. At 6 weeks of age the distribution of activities was independent of stocking density or group size. At 10 weeks of age, a slight but significant reduction of social interactions was observed above six rabbits per cage or 15.3 rabbits m(-2), while comfort and investigatory behaviours tended to increase. Although the experimental design did not allow dissociation of the respective effect of group size and stocking density, results suggest that six rabbits per cage, corresponding to a stocking density of 15-16 animals m(-2) (i.e. 40 kg m(-2) at 10 weeks of age) could be an acceptable threshold as far as behaviour is concerned in rabbits kept under intensive conditions. (C) 1997 Elsevier Science B.V

Activity. --- Age. --- Animal. --- Animals. --- Behaviour. --- Cage. --- Density. --- Design. --- Feeding. --- Group size. --- Group. --- Increase. --- Interaction. --- Interactions. --- Kept. --- Laboratory rabbit. --- Maintenance. --- Observation. --- Rabbit,stocking density,group size,housing. --- Rabbit. --- Rabbits. --- Reduction. --- Sequence. --- Sexual. --- Size. --- Social interaction. --- Social interactions. --- Social-interaction. --- Social. --- Stereotypic behaviour. --- Stereotypic. --- Time. --- Video.