China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (12): 3642-3649.doi: 10.16431/j.cnki.1671-7236.2019.12.022

• Genetics and Breeding • Previous Articles     Next Articles

Effect of Supernumerary Teat on Milk Performance and Genetic Expression Analysis of LGR5 Gene in Dairy Cows

WEN Hui1, LUO Hanpeng1, MI Siyuan1, LIU Xueqin1, WANG Yachun1, XIAO Wei2, YU Ying1   

  1. 1. College of Animal Science and Technology, Chinese Agricultural University, Beijing 100193, China;
    2. Beijing Animal Husbandry Station, Beijing 100029, China
  • Revised:2019-08-19 Published:2019-12-21

Abstract: This study was aimed to investigate the effect of supernumerary teat (SNT) on the milk performance of dairy cows and the relationship between mammogenesis gene LGR5 and supernumerary teat.Dairy herd improvement (DHI) data of 325 supernumerary teat and 737 non-supernumerary teat dairy cows in the same born year were collected to compare the differences in milk performance.The differential expression of LGR5 gene between supernumerary teat and non-supernumerary teat dairy cows was performed by Real-time quantitative PCR.The genetic mutation of LGR5 gene was detected by direct sequencing method.The results showed that the daily milk yield,peak milk yield and lactation persistence of non-supernumerary teat dairy cows were better than that of supernumerary teat dairy cows,but did not reach the statistical significant level.The expression of LGR5 gene in supernumerary teat dairy cows was significantly higher than that in non-supernumerary teat dairy cows (P<0.05).3 SNPs (rs42849472,rs42849471 and rs42849470) were identified in LGR5 gene intron 1.The frequency of AA genotype of 3 SNPs in supernumerary teat dairy cows were extremely significantly higher than that in non-supernumerary teat dairy cows (P<0.01).The results suggested that LGR5 gene might be involved in the occurrence of supernumerary teat in dairy cows,and could be used as an effective candidate gene.

Key words: dairy cows; supernumerary teat; non-supernumerary teat; milk performance; LGR5 gene

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