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Activity behaviour and social interactions of pigs in indoor and outdoor systems fed different levels of aminoacids were studied on 96 crossbred pigs (Hampshire × Swedish Landrace × Swedish Yorkshire). The pigs wereborn outdoors and raised indoors in conventional pens or outdoors on pastures and given recommended (R), 7 %lower (R-7) or 14 % lower (R-14) levels of amino acids, in a phase feeding system with a low-energy dietprovided <i>ad libitum</i>. Pigs in the outdoor system walked significantly more (p=0.012) and tended to be rootingmore (p=0.098) than indoor pigs. Amino acid level did not affect the activity behaviour and social interactions ofthe pigs. Indoor pigs given diets R-7 and R-14 were drinking significantly more often than indoor pigs receivingthe R diet, but had less contact with other pigs (p=0.020 and p=0.002, respectively). For outdoor pigs no sucheffect of amino acid level was found. Queuing for feed decreased with increasing age of the pigs, both indoorsand outdoors (p=0.009). Rooting decreased and sleeping increased with the age of indoor pigs (p=0.014 andp=0.001, respectively), whereas no consistent trend for outdoor pigs was found. Sniffing, nibbling, pushing(p=0.001 for all) and tail manipulation (p=0.002) occurred more often indoors than outdoors. The results showthat pigs in an outdoor system are more active and perform more natural behaviours, such as foraging androoting, than pigs in an indoor system. Furthermore, roughages, such as pasture, and large areas may play animportant role in occupying pigs and therefore contribute to less aggressive behaviours

Activity behaviour and social interactions of pigs raised outdoors and indoors