Nutritional requirements can be met, and carcass quality can be achieved by using concentrate supplementing (0, 1.5, and 3 % body weight) in the diets of lambs grazing tropical pastures (Panicum maximum cv. 'Aruana' and Brachiaria brizantha cv. 'Marandu'). The finishing period can be shorted with supplementation of 3 % of body weight. The discriminant analysis can identify differences between rearing systems based on all carcass traits. This analysis can be used in carcass traceability systems.