An experiment was conducted to enable quantitative trait loci (QTL) mapping forcarcass traits. The population consisted of 10 full-sib families originatingfrom a cross between male and female founders chosen from two different outcrossbroiler lines. Founder animals, parents, offspring, and grandoffspring aredenoted as generation (G) 0, 1, 2, and 3 animals, respectively. Microsatellitemarker genotypes were collected on G1 and G2 animals. Phenotypic observationswere collected on G3 animals. Recorded traits were BW at 48 d, carcass weight,carcass percentage, breast meat color, and leg score. Average adjusted progenytrait values were calculated for each G2 animal and for each trait afteradjusting phenotypic observations on G3 animals for fixed effects, covariables,the additive genetic contribution of the other parent, and differences betweensexes. The average adjusted progeny trait values were used as the dependentvariable in the QTL analysis. A QTL analysis was undertaken by modeling thesegregation from G1 to G2, using a full-sib across family regression intervalmapping approach. In total, 27 autosomal linkage groups covered with 420 markerswere analyzed. Genomewise significance thresholds were derived using thepermutation test and a Bonferroni correction. Two QTL, affecting two of the fiveanalyzed traits, exceeded suggestive linkage. The most significant QTL waslocated on Chromosome 1 at 466 cM and showed an effect on carcass percentage.The other QTL, which affected meat color, was located on Chromosome 2 and gave apeak at 345 and 369 cM.