This article suggests a method of classifying five types of activity exhibited by group-housed sows. The method
involves the measurement of acceleration in three dimensions. The five activities are: feeding, walking, rooting, lying laterally and lying sternally. The results show that feeding and lateral/sternal lying activities are best recognized;
walking and rooting activities are mostly recognized by a specific axis corresponding to the direction of the
sow’s movement while performing the activity (horizontal sidewise and vertical). Various possible
improvements of the suggested approach are discussed.