Scientia Agricultura Sinica ›› 2010, Vol. 43 ›› Issue (23): 4936-4941 .doi: 10.3864/j.issn.0578-1752.2010.23.020

• VETERINARY SCIENCE • Previous Articles     Next Articles

Polymorphism of LYZ Gene and Its Association with Mastitis Trait in Chinese Holstein

CHEN Ren-jin, YANG Zhang-ping, MAO Yong-jiang, CHEN Ying, CHANG Ling-ling,WU Hai-tao, JI De-jun, LI Yun-long,ZHANG Ya-qin
  

  1. (扬州大学动物科学与技术学院)
  • Received:2010-07-15 Revised:2010-08-09 Online:2010-12-01 Published:2010-12-01
  • Contact: YANG Zhang-ping

Abstract:

【Objective】 The polymorphism of coding region of LYZ gene and its correlation with somatic cell score (SCS) and 305 d milk yield in Chinese Holstein were analyzed for the purpose of providing molecular markers in the marker-assisted selections (MAS) to accelerate the disease-resistant breeding progress in Chinese Holstein .【Method】 The polymorphism of LYZ gene was detected by polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) technique in 610 Chinese Holstein cattle from 30 bull families. The associations between polymorphic sites of LYZ gene and SCS and 305 d milk yield were analyzed by the least square mean analysis. 【Result】 The 115(T>G)mutation site was found in the exon1, and the mutation resulted in an amino acid change of Arg→Leu, for the polymorphic site, three genotypes (TT, TG and GG) were found in 610 Chinese Holstein by PCR-SSCP,and the frequency of TT, TG and GG genotypes was 0.270, 0.508 and 0.222, respectively. Chi-square tested showed Chinese Holstein was not in Hardy-Weinberg equilibrium at the site. Least square mean of SCS for GG genotype was highly and significantly lower than that for TT (P<0.01), and significantly lower than TG genotype (P<0.05). Least square mean of 305 d milk yield for GG genotype was greatly and significantly higher than that for TT (P<0.01), and significantly higher than TG genotype (P<0.05).【Conclusion】 GG genotype at 115(T>G)site had a great genetic effect on SCS and 305 d milk yield in Chinese Holstein, which can be used as a candidate marker for mastitis resistance selection in dairy cattle.

Key words: Chinese Holstein, LYZ gene, PCR-SSCP, polymorphism, SCS, 305 d milk yield, mastitis resistance

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