Increased novelty-induced grooming in aged rats: a preliminary observation.
Age-related changes in grooming activity in female Fischer-344 rats were observed in a home cage and in a novel testing chamber for 50 min. Compared to the home cage condition with brief handling treatment, excessive grooming was found in the novel situation. The amount of novelty-induced grooming of aged rats (26-28 months) was about two times that of young animals (6-8 months). This increase in novelty-induced grooming of aged animals was attributable to an increase in the number of grooming bouts, prolongation of each grooming bout, and a slight increase in the duration of licking elements. However, there were no age differences in the percentage of face washing and the duration of face-washing elements. These results are discussed in terms of behavioral aging and age-related changes in peptidergic pathways in the brain.
D000375:Aging; D000818:Animals; D001143:Arousal; D005260:Female; D006120:Grooming; D006234:Handling, Psychological; D051381:Rats; D011916:Rats, Inbred F344; D012931:Social Environment