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| Associations between Genetic Polymorphisms at Five Loci and Milk Production Traits in Xi'an Population of Chinese Holstein |
| ZHANG Run-feng;CHEN Hong;LEI Chu-zhao;FANG Xing-tang;SUN Wei-bin;HU Shen-rong;SU Li-hong |
| College of Animal Science and Technology, Northwest Agriculture and Forestry University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling 712100, China |
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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)
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Received: 17 May 2005
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Corresponding Authors:
CHEN Hong
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