A whole genome scan for quantitative trait loci (QTL) affecting 7 wool traits was carried out in a research flock of Merino sheep. The flock consisted of 543 progeny in four paternal half sib families. The progeny sizes were between 87 and 190. Selective genotyping was used on top and bottom 25% of each family progeny The final marker panel was 223, which was selected based on parasite resistance. The genome scan found significant QTL over all seven traits. The analysis showed 13 significant QTL at the 1%CW (chromosome wide) in regions with good information content. The highly significant QTL for wool traits were seen for Greasy fleece weight, Fibre Diameter, Fibre Diameter_Coefficient of Variation, Staple Length and Staple Strength on different chromosomes. There were three significant QTL for GFW and FD at 1%CW. The analysis showed two QTL in one chromosome for SL which was segregating in two families. The selective genotyping on correlated traits probably has decreased the power of QTL detection and might result in over estimate of QTL effect. The false discovery rate at the 1%CW was 0.57. The results show segregating of putative QTL relevant to some wool traits in Merino sheep and estimated QTL parameters indicate the genome positions that can be fine mapped in future works.

N. Moghaddar, K. Marshall, Julius HJ van der Werf

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 05.10, 2006
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