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Current research aimed to evaluate the effects of pasture quality and feeding management on carcass quality in fattening lambs in pasture based finishing systems. Turcana lambs and F1 German Blackheaded x Turcana cross-breds were used in 8 experimental groups, on two divergent production systems, conventional versus organic, respectively. On each type of pasture, two sub-variants were included, with and without concentrate feeding. Under conventional system, commercial yield of the carcasses ranged from 54.8±0.37 to 52.6±0.28 %, with both genotype and concentrates feeding influencing significantly (p≤0.05) the carcass yields. Under organic production, concentrates allowance did not influenced (p>0.05) the carcass yields of the lambs within the genotypes, being registered significant (p≤0.05) differences between the two genotypes. It was concluded that both pasture quality and concentrates allowance have a strong influence in lambs finished conventionally, and that under organic production the genotype is the main factor to influence carcass yields.