The size of the REA was different (P < 0.05) between thegenetic groups (Table 3), as was expected by the differencesin carcass weight. However, when the rib eye area was esti-mated as a function of the BWS or CCW (REA/100 kg BWS,REA/100 kg CCW), no difference was observed between thegenetic groups, indicating that the lambs tested have thesame amount of muscle per unit of body weight or coldcarcass weight.