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Asian-Australas J Anim Sci > Volume 33(12); 2020 > Article
Animal Breeding and Genetics
Asian-Australasian Journal of Animal Sciences 2020;33(12): 1905-1911.
DOI: https://doi.org/10.5713/ajas.19.0752    Published online January 13, 2020.
Evaluating genetic diversity and identifying priority conservation for seven Tibetan pig populations in China based on the mtDNA D-loop
Qianyun Ge1  , Caixia Gao2  , Yuan Cai1  , Ting Jiao3  , Jinqiang Quan1  , Yongbo Guo4  , Wangshan Zheng4  , Shengguo Zhao1,* 
1College of Animal Science & Technology, Gansu Agricultural University, Lanzhou 730070, China
2State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
3College of Grassland, Gansu Agricultural University, Lanzhou 730070, China
4State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, China
Correspondence:  Shengguo Zhao, Tel: +86-139-09469015, Fax: +86-931-7632468, Email: zhaoshengguo0628@hotmail.com
Received: 27 September 2019   • Revised: 13 December 2019   • Accepted: 21 December 2019
Abstract
Objective
Tibetan pigs, an excellent species unique to China, face serious threats, which in turn affects the development and utilization of the outstanding advantages of plateau hypoxia adaptability and reduces their genetic diversity. Therefore, a discussion of measures to conserve this genetic resource is necessary. The method, based on genetic diversity, genetic divergence and total genetic contribution rate of population, reflects the priority conservation order and varies depending on the three different purposes of conservation.
Methods
We analyzed mitochondrial DNA control region (D-loop) variation in 1,201 individuals from nine Tibetan pig populations across five provinces and downloaded 564 mtDNA D-loop sequences from three indigenous pig breeds in Qinghai, Sichuan, and Yunnan Provinces distributed near the Tibetan pigs.
Results
We analyzed three different aspects: Changdu Tibetan pigs have the highest genetic diversity, and from the perspective of genetic diversity, the priority conservation is Changdu Tibetan pigs. Hezuo Tibetan pigs have the highest genetic contribution, so the priority conservation is Hezuo Tibetan pigs in the genetic contribution aspect. Rkaze Tibetan pigs were severely affected by indigenous pig breeds, so if considering from the perspective of introgression, the priority conservation is Rkaze Tibetan pigs.
Conclusion
This study evaluated genetic diversity and comprehensively assessed conservation priority from three different aspects in nine Tibetan pig populations.
Keywords: Tibetan Pigs; mtDNA D-loop; Genetic Diversity; Conservation


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