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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0606    [Accepted] Published online November 12, 2019.
Evaluation of the genetic diversity of six Chinese indigenous chickens
Yuzhu Sha1  , Caixia Gao2  , Meimei Liu1  , Shengguo Zhao1,* 
1College of Animal Science and 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
Correspondence:  Shengguo Zhao, Tel: +86-18894314093, Fax: +86-931-7632468, Email: zhaoshengguo0628@hotmail.com
Received: 28 July 2019   • Revised: 22 September 2019   • Accepted: 30 October 2019
Abstract
Objective
The extensive breeding of commercial chickens has led to a sharp decrease in the resources of a large number of indigenous chickens, especially the indigenous chickens in the southeastern coastal region, which are on the verge of extinction, and the indigenous chickens in the northwestern region of China, which are also at risk. However, there are few reports on the evaluation of genetic diversity and conservation of genetic resources of indigenous chickens in remote areas in the Northwest of China.
Methods
In the present study, the genetic diversity and phylogenetic relationship of six indigenous chickens from different regions were studied based on variation in mitochondrial DNA control region (D-loop), and the degree of introgression from commercial breeds into these chickens was determined by the number of haplotype sharing between indigenous and commercial breeds.
Results
Twenty-five polymorphic sites and 25 haplotypes were detected in 206 individuals. Principal component analysis showed that the Jingning (JN) chicken had the highest genetic diversity among the six indigenous chickens. According to the degree of introgression, the six indigenous breeds may be involved in commercial breed production, and the introgression from commercial chickens into the Haidong (HD) chicken is the most serious.
Conclusions
The genetic resources of indigenous chickens have been eroded, so it is necessary to consider the protection of their genetic resources. Phylogenetic analysis suggests that the six indigenous chickens have two major matrilineal origins: one from Yunnan or its surrounding areas in China and the other from the Indian subcontinent.
Keywords: Genetic Diversity; Phylogeny; Indigenous Chicken; Maternal Origin


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