A mapping population segregating for egg quality traits was created by a linecross between two egg layer lines and screened by a genome scan. The F2generation consisted of 307 hens, which were scored for egg quality andproduction traits. The mapping population was genotyped for 99 microsatelliteloci, spanning nine macrochromosomes and five small linkage groups. The linkagemaps were used in mapping QTL affecting 14 traits, by using multiple markers anda least-squares approach. We detected 14 genomewide significant and sixsuggestive QTL that were located on chromosomes 2, 3, 4, 5, and, 8 and sexchromosome Z. A significant QTL affecting egg white thinning was found onchromosome 2. For eggshell strength, a significant QTL was found on chromosomeZ. For production traits, the most interesting area was on chromosome 4, wherehighly significant QTL effects were detected for BW, egg weight, and feed intakein the same area. The most significant QTL explains 25.8% of the phenotypicvariance in F2 of body weight. An area affecting the age at first egg, eggweight, and the number of eggs was located on chromosome Z.