ABSTRACT
Sheep farming systems differ nationally and internationally. They are developed to suit the physical environment and the available markets for meat, wool or milk (Goddard, 2011; Kilgour et al., 2008; Cottle, 1991; Gatenby, 1986). The value of the lamb to the farming enterprise will depend on whether it is the primary flock product (lamb meat production) or a less significant by-product, as in flocks which are primarily wool or milk producers (Goddard, 2011). Hair sheep produce meat (e.g. Dorper), other breeds produce meat but have poor-quality wool (e.g. Suffolk) or shed wool (e.g. Wiltshire) (Southby, 2008). Some sheep breeds are dual purpose and produce meat and wool (e.g. New Zealand Romney). Lambs are valued product of these breeds and high lambing rates (Geenty, 1997) and maintaining high standards of lamb survival, health, nutrition and growth are essential for farm profitability. Market forces may insist on farmers maintaining high standards of welfare of lambs (Milne et al., 2008).
