【摘要】 首次以IGFBP-3基因作为中国荷斯坦牛泌乳性状的候选基因,对中国荷斯坦奶牛群5个基因位点中4个多态基因位点与泌乳性状进行了相关分析。κ-cn、β-lg、β-lg5’侧翼区和IGFBP-3多态基因位点基因型与泌乳性状的最小二乘分析和多重比较表明,κ-cn基因位点基因型对所有的性状影响不显著;IGFBP-3BB型的305d泌乳量显著高出AA、AB型1054.17kg和838.15kg(P<0.05),AB型的乳蛋白率显著高于BB型(P<0.05);β-lgAA型对乳脂率与乳蛋白率的比值有正效应,AB型对乳蛋白率具有负效应;β-lg5’侧翼区AA型的305d泌乳量显著高于AB型(P<0.05),AA型的乳脂率显著高于BB型(P<0.05),BB型的乳蛋白率显著高于AB型(P<0.05)。更多还原

【Abstract】 The genotypes’ effects of four polymorphic loci on milk production traits of the Holstein cattles were analyzed using insulin-like growth factor binding protein 3 (IGFBP-3) gene as a candidate gene of milk production traits in Chinese Holstein cattle firstly. The effects of genotypes of κ-cn locus on the traits were not statistically significantly(P>0.05). At IGFBP-3 locus, 305 days milk yield of individuals with genotype BB was higher than that of individuals with genotype AA and AB for 1054.17 kg and 838.15 kg respectively(P <0.05), the protein percent of individuals with genotype AB was higher than that of individuals with genotype BB (P <0.05). Genotype AA of β-lg locus had significantly positive effect on fat/protein ratio, Genotype AB had significantly negative effect on the protein percent. At β-lg gene 5′flanking region, 305 days yield of individuals with genotype AA was higher than that of individuals with genotype AB(P <0.05), the fat percent of individuals with genotype AA was higher than that of individuals with genotype BB(P <0.05), but individuals with genotype BB had higher protein percent than individuals with genotyupe AB(P <0.05).更多还原