The importance of kinship and familiarity in social interactions between mice

Abstract We investigated a range of social interactions between mice which differed in their degree of relatedness and familiarity. Unfamiliar half siblings (sharing paternity only) differed significantly from unfamiliar non-siblings (sharing neither mother nor father) in their tendency to perform aggression-related interactions and in the amount of passive body contact they showed. Differences between half and full siblings in patterns of interaction appeared to be due to differing degrees of familiarity with companions. Kinship effects disappeared completely when animals were allowed to become familiar. We discuss the functional significance of the familiarity and kinship effects we found, including differences between the sexes in the types of interaction showing kinship effects. Differences between adult and juvenile mice are also briefly discussed.

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