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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (5): 134-145.DOI: 10.11686/cyxb2020212

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Genetic structure and diversity of Yading yak and Larima yak populations

Hui JI1,2(), Jiu-qiang GUAN1, Hui WANG2, Jian-xu ZHOU3, Nong-ga A4, Zong-wei HE5, Zhen-xiang FAN6, Long-kang QIU6, Shi-xiao CAO1, Tian-wu AN1, Qin BAI1, Jin-cheng ZHONG2(), Xiao-lin LUO1()   

  1. 1.Sichuan Academy of Grassland Sciences,Chengdu 611731,China
    2.Southwest Minzu University,Chengdu 610041,China
    3.Xiaojin County Science,Technology,Agriculture,Animal Husbandry and Water Authority,Tibetan Qiang Autonomous Prefecture of Ngawa 624200,China
    4.Ganzi Tibetan Autonomous Prefecture Animal Husbandry Station,Ganzi Prefecture 626099,China
    5.Daocheng County Agriculture,Animal Husbandry and Technology Bureau Animal Husbandry Station,Ganzi Prefecture 627750,China
    6.Xinlong County Agriculture,Animal Husbandry and Rural Science and Technology Bureau Animal Husbandry Station,Ganzi Prefecture 626800,China
  • Received:2020-05-12 Revised:2020-08-19 Online:2021-05-20 Published:2021-04-16
  • Contact: Jin-cheng ZHONG,Xiao-lin LUO

Abstract:

Yading yak and Larima yak are excellent local yak resources for meat and milk production. The aims of this study were to explore the genetic diversity of Yading yak and Larima yak and the genetic relationships among yak populations. We conducted restriction site associated DNA simplified genome sequencing for Yading yak, Larima yak, and seven other local yak populations (Jiulong yak, Maiwa yak, Jinchuan yak, Changtai yak, Zhongdian yak, Yushu yak, and Leiwuqi yak). Genetic statistics were calculated based on the detected single nucleotide polymorphism information. The observed heterozygosity values of Yading yak and Larima yak populations were 0.2186 and 0.2233, respectively. The genetic diversity of Yading yak was relatively poor. The average genetic differentiation index (Fst value) of Yading yak was 0.0653, which was moderately different from those of other Yak populations. A Structure analysis showed that the pedigree of Yading yak is pure, so it can be classified as an independent genetic resource. The lowest Fst value was that of Larima yak (0.0443). Our analyses suggest that the population genetic structure is more complicated for Larima yak than for other yak populations. Our results indicate that here have been genetic exchanges between Larima yak and Jiulong yak as well as Maiwa yak, and that Larima yak is one of the ancestor groups of Maiwa yak. Further research on Yading yak and Larima yak is warranted, and both populations require protection. The results of this study will be useful for developing strategies to protect and utilize yak genetic resources.

Key words: yak, genetic diversity, population structure, simplified genome sequencing