... University of New England,Armidale, pp. 15–18.[41] Weller J.I., Kashi Y., Soller M., Power of daughter and granddaughter designs for determining linkage between marker loci and quantitative trait loci ... genera-tions. The single trait mixed animal models used for litter traits included thefixed effects of sow parity, month of farrowing, and herd*year*type of mating(i.e. AI or natural mating) combination, ... DISCUSSION4.1. Design and methodsExploiting existing familial structures in commercial populations is an ap-proach of choice for QTL mapping, in particular for reproduction traits, since:(1) it avoids...