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Quantitative Trait Loci Affecting Milk Yield and Protein Percentage in a Three-Country Brown Swiss Population

Quantitative Trait Loci Affecting Milk Yield and Protein Percentage in a Three-Country Brown Swiss Population,10.3168/jds.2007-0507,Journal of Dairy S

Quantitative Trait Loci Affecting Milk Yield and Protein Percentage in a Three-Country Brown Swiss Population   (Citations: 11)
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Quantitative trait loci (QTL) mapping projects have been implemented mainly in the Holstein dairy cattle breed for several traits. The aim of this study is to map QTL for milk yield (MY) and milk protein percent (PP) in the Brown Swiss cattle populations of Austria, Ger- many, and Italy, considered in this study as a single population. A selective DNA pooling approach using milk samples was applied to map QTL in 10 paternal half-sibdaughter familieswithoffspring spanningfrom 1,000 to 3,600 individuals per family. Three families were sampled in Germany, 3 in Italy, 1 in Austria and 3 jointly in Austria and Italy. The pools comprised the 200 highest and 200 lowest performing daughters, ranked by dam-corrected estimated breeding value for each sire-trait combination. For each tail, 2 indepen- dent pools, each of 100 randomly chosen daughters, were constructed. Sire marker allele frequencies were obtained by densitometry and shadow correction analy- ses of 172 genome-wide allocated autosomal markers. Particular emphasis was placed on Bos taurus chromo- somes 3, 6, 14, and 20. Marker association for MY and PP with a 10% false discovery rate resulted in nominal P-valuesof0.071and0.073forMYandPP,respectively. Sire marker association tested at a 20% false discovery rate (within significant markers) yielded nominal P- values of 0.031 and 0.036 for MY and PP, respectively. There were a total of 36 significant markers for MY, 33 for PP, and 24 for both traits; 75 markers were not significant for any of the traits. Of the 43 QTL regions found in the present study, 10 affected PP only, 8 af- fected MY only, and 25 affected MY and PP. Remark-
Journal: Journal of Dairy Science - J DAIRY SCI , vol. 91, no. 2, pp. 767-783, 2008
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