Fenske, M. 1992. Body weight and water intake of guinea pigs: influence of single caging and an unfamiliar new room. Journal of Experimental Animal Science 35, 71-79.

No changes in body weight are observed if adult male guinea pigs are removed from their groups and kept singly in their home enclosure. In contrast, subjects markedly lose weight and show a marked reduction of water intake if isolated from their groups and caged singly in an unfamiliar test room. It is recommended that if guinea pigs have to be caged singly, they should remain in their home room, for enabling them to express their need for olfactory/auditory contact with conspecifics.