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The main objective was to locate QTL and estimate the proportion of total genetic varianceattributable to quantitative trait loci (QTL) for production index traits and the udder healthindex identified on six <i>Bos taurus</i> autosomes in the Danish Holstein dairy cattle population.  Data were obtained from a granddaughter design of 20 sire families with a total of 1 869progeny tested sons. The number of sons per grandsire ranged from 20 to 284, with anaverage family size of 93.5. Indexes of the estimated breeding values were obtained for themilk production traits and for the udder health index from the Danish Agricultural AdvisoryService database.  A random-QTL model was applied to incorporate marker information into parameterestimation for each single QTL. The procedure allowed us to detect new QTL on BTA3, BTA16and BTA28 and to estimate the proportion of total genetic variance attributed to differentQTL on a total of six <i>Bos taurus</i> autosomes for the udder health index and yield index traitsin the Danish Holstein population. Variance estimates vary between 2 to 58 % of the totalvariance for different QTL and seem to explain a substantial part of the variance at certainpositions of the cattle genome.  The results are discussed against the background of the failure of marker-assisted selection(MAS) and the recent availability of large panels of single nucleotide polymorphisms (SNPs)that have improved the search for mutations underlying variation in complex traits resultingin modern genomic selection

QTL explaining variation in production traits and udder health in the Danish Holstein population