Aggression and group size in domesticated pigs, Sus scrofa: 'when the winner takes it all and the loser is standing small'

By I. Andersen, Eric Nævdal, M. Bakken, K. Bøe. 2004

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The effect of pre-weaning housing on the play and agonistic behaviour of domestic pigs (2007, background): “It is possible that pigs may have become more selective in the larger groups to which group members they chose to fight with or that they generally restrict fighting because establishing a dominance relationship with so many animals is too costly (Andersen et al., 2004).”
The impact of group size on damaging behaviours, aggression, fear and stress in farm animals § (2007, background): “Similarly, in pigs more fights occurred after mixing in groups of 6 and 12 pigs than in groups of 24 pigs and the percentage of pigs not participating in fights was higher in the largest group (Andersen et al., 2004).”