A genomic scan was conducted on 540 reciprocal backcross Meishan x Whitecomposite pigs for hot carcass weight (HCWT); loin eye area (LOIN); carcasslength (CRCL); belly weight (BELLY); and weight of trimmed ham, loin, picnic,and Boston butt adjusted to a constant live (TWPLWT) or carcass (TWPCWT) weight.Genetic markers spanned the entire porcine linkage map and were spaced atapproximately 20-cM intervals. Grandparental breed of origin for all chromosomalsegments was determined using multipoint linkage procedures, and a least squaresregression analysis was conducted. Nominal P-values were converted to agenome-wide level of significance to adjust for the number of tests actuallyconducted. Seven associations were significant at the genome-wide level relatingto chromosomes 1 (SSC 1), 7 (SSC 7), and X (SSC X). The SSC 1 region affectedLOIN, TWPLWT, and TWPCWT; SSC 7 affected HWCT and CRCL; and SSC X affectedTWPLWT and TWPCWT. Twelve associations relating to seven chromosomal regions(including SSC 1 and X) presented suggestive evidence for quantitative traitloci (QTL), and many of these regions are likely to contain QTL. Chromosomes 8and 14 had two and three traits with suggestive evidence for QTL, respectively.Many pleiotropic effects were detected for regions on SSC 1, 7, 14, and X inthis study and a companion study looking for fat deposition QTL in the samepopulation. In addition, SSC 4 was nearly significant for CRCL in the sameregion identified as affecting backfat in a wild boar x Large White population.These results expand our knowledge of the inheritance of quantitative traits andare directly relevant to composite populations containing Meishan germplasm.