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The effects of pre-mixing as a technique for facilitating subgroup formation in large dynamic groups was examined. Pre-mixing involved housing small groups of sows together prior to introducing them into an established large dynamic group. Each week, four unfamiliar sows were assigned to either a 'pre-mixed' or 'direct introduction' treatment, with eight groups of four sows allocated to each treatment in total. In the pre-mixed treatment, each group of four sows were housed together for 5 weeks prior to introduction into a large dynamic group of 33 sows. In the direct introduction treatment, each group of four sows were introduced directly into a second large dynamic group of 33 sows. Data on subgroup behaviour was collected during the sows' first 5 weeks in the dynamic groups. This involved recording lying, social and agonistic interactions and whether interacting sows were subgroup members (the four sows introduced at the same time into the large dynamic group) or non-subgroup members. The findings suggest that if small groups of sows are introduced together into a large dynamic group they will form separate subgroups, regardless of whether they are familiar (pre-mixed treatment) or unfamiliar (direct introduction treatment) prior to their introduction. However, pre-mixing small groups of sows prior to their introduction together into a large dynamic group appears to strengthen subgroup behaviour during their first week in the group and also appears to reduce aggression between subgroup members and between new and resident sows during this period

Aggression. --- Agonistic. --- Behaviour. --- Group. --- Housing. --- Interaction. --- Interactions. --- Lying. --- Social. --- Sow. --- Sows. --- Time. --- Treatment.

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