Abstract
Abstract. Isolated adult male CFLP mice were exposed in their home cage to the odours of unfamiliar males and females. Their immunocompetence and resistance to subsequent experimental infection with Babesia microtiwere lower than those of control animals. Males that had held high social rank in previously established groups had a more severer infection than those that had been low rankers. The reduction in resistance among high rankers was most pronounced when female odours were combined with the odours of another male. Analysis of changing serum hormone concentrations over the period of exposure to odours suggested that hormone-related resistance reflected the degree of modulation of immunodepressive hormones in relation to current immune status. The results are interpreted in terms of adaptive trade-offs between immune function and competing metabolic demands.
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