在猪12号染色体上定位数量性状位点

为了找出猪１２号染色体上的数量性状位点，在２个家系中测定了１０个遗传标记，并记录了５１个重要经济性状。该２家系，一个由欧洲野猪与皮特兰杂交而成，另一个由梅山与皮特兰杂交建成。应用最小二乘法进行了数量性状位点定位，同时进行了生长激素基因型与性状间的相关分析。应用最小二乘法并未发现数量性状位点，而应用相关分析发现生长激素基因型与某些膘情性状高度相关。带有基因型Ｃ１Ａ２／Ｃ４Ａ２的猪比带有基因型Ｃ２Ａ２

Identification of QTL Affecting Important Traits on Porcine Chromosome 12

To screen the whole porcine chromosome 12 for QTL affecting economically important traits, ten genetic markers were genotyped in two F2 populations generated from the cross of genetically diverse breeds: European Wild pig and commercial pig breed Pietrain (W×P), and Chinese Meishan and Pietrain (M×P). Fifty杘ne traits were recorded. A least squares method was used for chromosome-wide screening for QTL. An association analysis between genotypes at the GH locus and traits was also carried out. The least squares analysis did not reveal the presence of genome-wide significant QTL affecting the traits, while the association study showed significant (P＜0.01) associations between GH genotypes and fatness traits in M×P, but not in W×P. F2 pigs carrying the genotype C1A2／C4A2 at the GH locus displayed the thinnest backfat (21.76mm), while the ones carrying the genotype C2A2／C2A2 had the thickest (31.41mm).