Authors: X X Wu Z P Yang X K Shi J Y Li D J Ji Y J Mao L L Chang H J Gao
Publish Date: 2011/05/24
Volume: 39, Issue: 2, Pages: 1065-1071
Abstract
Intramuscular fat IMF is a key parameter for evaluation of nutritional quality of beef with its endogenous synthesis regulated by stearoyl CoA desaturase SCD1 and diacylglycerolacyl transferase 1 DGAT1 genes in cattle The object of this research was to evaluate the effect of SCD1 and DGAT1 polymorphisms on IMF trait in beef cattle and to estimate the frequency distribution of SNPs in the two genes in Chinese cattle populations The SCD1 and DGAT1 polymorphisms were detected by PCRsingle strand conformation polymorphism PCRSSCP method in Chinese Simmental cattle and their associations with IMF traits were analyzed using the general linear model GLM The frequency distribution of SNPs in SCD1 and DGAT1 genes were detected by PCRSSCP method and analyzed in seven other cattle populations The results showed significant associations of SNPs SCD1878 SCD1762 and DGAT1 10433 and 10434 with IMF and shearing force values SFV kg in Chinese Simmental cattle A haplotype combining SCD1878C SCD1762T and DGAT1 10433 and 10434GC had the highest IMF marbling score and shearing force The polymorphic investigation indicated that the frequency of SCD1878C or SCD1762T was significantly higher in Chinese southern cattle Leiqiong Yunnan High pump BMY or Minnan Cattle than in Chinese northern cattle Chinese Simmental Luxi Cattle Bohai Black or Chinese Holstein while the frequency of DGAT1 10433 and 10434GC in Chinese indigenous breed Leiqiong Yunnan High pump BMY Luxi Cattle Bohai Black or Minnan Cattle was significantly lower than breeds with imported blood Chinese Simmental or Chinese Holstein These findings demonstrated that both the SCD1 and DGAT1 SNPs were prospect genetic markers for IMF traits and the SCD1 SNPs could be used as a genetic marker for southern or northern blood in Chinese cattleThis project was supported by National Plan of Scientific and Technological Support 2008BADB2B0306 863 Key Projects 2008AA101010 We thank Dr Hou GY and Mr Huang BZ for helpful comments and providing us with blood samples for the research
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