A total of the 550 F2 animals produced by divergent cross using two sires of the native Brazilian breed named Piau and 18 commercial dams were genotyped for 13 microsatellite markers in swine chromosome 6. The traits evaluated were: carcass length by the Brazilian carcass classification method, carcass length by the American carcass classification method, carcass weight, carcass yield, higher backfat thickness at last 2nd-3rd thoracic vertebrae, backfat thickness after last rib, backfat thickness between last 1st-2nd lumbar vertebrae, lower backfat thickness after last lumbar vertebrae, backfat thickness after last rib, at 6,5 cm from the midline, average backfat thickness (global = estimated by average of all backfat thickness; and midline = estimated by average of midline backfat thickness), bacon depth, loin depth and loin eye area; internal organs weight (heart, lungs, liver, kidney and spleen), and intestine length. Data were analyzed by multiple regression using the interval mapping method from the QTL Express software. Suggestive QTL were found for carcass length by the Brazilian method and bacon depth and a significant one for kidney weight. Additional markers should be included in the peak intervals of the suggestive F-values to confirm the presence of QTL.
animal breeding; divergent cross; QTL; molecular genetic
