title: The critical point at which post-weaning individual housing conditions affect the emission of 22-kHz calls in male rats.
abstract: It is known that long-term post-weaning individual housing significantly reduces emissions of 22-kHz calls in male rats. In this study, we assessed post-weaning successive changes in 22-kHz calls emitted by male rats under two different types of post-weaning housing conditions (individually and socially). In addition, we evaluated the critical point at which a significant reduction in 22-kHz calls could be observed in male rats housed individually after weaning. Significantly fewer 22-kHz calls were emitted by individually housed rats compared to socially housed rats at 16 weeks of age, indicating that 13 weeks after weaning may be a critical point for the reduction of 22-kHz calls caused by post-weaning individual housing.
authors.affiliation: Laboratory of Veterinary Ethology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Inagaki
authors.forename: Yuji
authors.initials: Y
authors.lastname: Mori
mesh_terms: D000818:Animals; D006799:Housing, Animal; D008297:Male; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012919:Social Behavior; D014828:Vocalization, Animal / Q000502:physiology*