149. It is the practice in the UK to select relatively docile sows for outdoor production on the basis that they are easier to manage and have good mothering instincts. As a result, injury arising from aggression between animals is relatively rare. The large space available for avoidance and escape, together with proper management attention, also help to reduce aggression. The protective instincts of sows with strong mothering ability should be recognised as being distinct from general aggression towards other stock.