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Abstract

The influence of isolation on ♂-♀♀ relationships was investigated. Animals isolated between 90 and 200 days of age showed more agonistic behaviour in paired encounters than controls. This difference disappeared when the animals had been housed with a cagemate. A secondary isolation late in life resulted in a more rapid onset of agonistic behaviour in the early isolates than in the controls. Thus it is concluded that the early isolation had a lasting influence, which only became evident after renewed isolation treatment.