Maternal behaviour refers to the ewe’s behaviour towards its lamb(s). It can be scored through assessing the distance a ewe travels from the lamb when handled by operators when tagging at birth. Maternal behaviour can vary from the ewe staying close by to running away and not returning. A breeding value for maternal behaviour score (MBS) can be estimated as long as the trait is measured in a consistent manner across flocks. Repeated measurements of the ewe over her lifetime will increase the accuracy of the breeding value estimated.