Pair housing adult female rhesus macaques: Is it always the best option? (2004)

McMillan, J. L., Maier, A., Coleman, K.

Abstract

Cortisol levels between compatible pairs and individually caged animals revealed no significant difference. Cortisol levels had the tendency of being higher (p=0.09) in individually caged animals who had their partner removed for experimental purposes than in individually caged animals who had lost their partner due to incompatibility. While pair housing may be a preferred option for most caged monkeys, it may not be ideal for all individuals.