Results from a QTL experiment on growth and carcass traits in an experimental F2cross between Iberian and Landrace pigs are reported. Phenotypic data forgrowth, length of carcass and muscle mass, fat deposition and carcasscomposition traits from 321 individuals corresponding to 58 families wererecorded. Animals were genotyped for 92 markers covering the 18 porcineautosomes (SSC). The results from the genomic scan show genomewide significantQTL in SSC2 (longissimus muscle area and backfat thickness), SSC4 (length ofcarcass, backfat thickness, loin, shoulder and belly bacon weights) and SSC6(longissimus muscle area, backfat thickness, loin, shoulder and belly baconweights). Suggestive QTL were also found on SSC1, SSC5, SSC7, SSC8, SSC9, SSC13,SCC14, SSC16 and SSC17. A bidimensional genomic scan every 10 cM was performedto detect interaction between QTL. The joint action of two suggestive QTL inSSC2 and SSC17 led to a genome-wide significant effect in live weight. Theresults of the bidimensional genomic scan showed that the genetic architecturewas mainly additive or the experimental set-up did not have enough power todetect epistatic interactions.