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Novelty-induced grooming was studied in aged male rats (24 months old) compared to young animals (3 months old). When put in a novel environment, aged rats exhibited a grooming activity markedly higher than that shown by young rats. Such an excessive grooming did not disappear over a 30 min observation. Furthermore, no significant difference between old and young rats was found in ambulation, rearing and defecation, as observed in an open field. It may be suggested that increased grooming activity in aged rats involves a disability to adapt to a novel environmental situation.
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