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The aim of this study was to test a method to automatically detect aggressive behaviour in pigs, by using an activity index and a multilayer feed forward neural network. An experiment was carried out on a mixed group of 11 male pigs weighing on average 23 kg. During the first 3 days after mixing, the pigs were recorded for video analysis. Out of the total video recording time (8 h or 28,800 s), 643 s...