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In the present study, we report the complete mitochondrial genome of Niangya yak (Bos grunniens) and its phylogenetic inferences. The complete mitochondrial DNA is a circular molecule with 16,322 bp length consisting of 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes, and a non-coding control region(D-loop). Both ND6 and 7 tRNAs (tRNA-Pro, tRNA-Glu, tRNA-Tyr, tRNA-Cys, tRNA-Asn, tRNA-Ala and tRNA-Gln) are encoded on the light strand, and the remaining genes are encoded on the heavy strand. The overall nucleotide composition is A(33.73%), T(27.28%), C(25.80%), G(13.19%) respectively. The content of C + G is 38.99%. Given that yak is indispensable for the Tibetan people, it is important to understand the genetic status of the population for further systematic genetics, evolutionary significance and protection of genetic resources. Therefore, to understand the evolutionary history of Niangya yak, the complete mitochondrial genome of Niangya yak was sequenced and compared with the mitochondrial genome of closely related Bos species., Competing Interests: The authors declare that there are no financial and personal relationships with other people or organizations that can inappropriately influence our work, and no professional or other personal interest of any nature or kind in any product, service and company that could be construed as influencing the position presented in, or the review of the manuscript., (© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Sibu yak is famous for its excellent breed in Tibet and has become a magic way for local herdsmen to get rich. The Sibu yak, however, has been identified as an endangered bovine species. In this study, the complete mitochondrial genome of Sibu yak ( Bos grunniens ) was sequenced. The complete mitochondrial genome is a circular molecule with 16,324 bp in length, including 2 rRNA genes, 13 protein-coding genes, 22 tRNA genes, and a non-coding control region (D-loop). The entire nucleotide composition is A(33.70%), T(27.27%), C(25,81%), G(13.21%), respectively. Except that ND6 and 7 tRNAs （tRNA-Glu,tRNA-Pro,tRNA-Cys, tRNA-Tyr, tRNA-Ala, tRNA-Asn, and tRNA-Gln) are encoded on the light strand, the remaining genes are encoded on the heavy strand. As a valuable resource, we have compared it to related Bos species to understand the evolutionary history of Sibu yak., Competing Interests: The authors declare that there are no financial and personal relationships with other people or organizations that can inappropriately influence our work, and no professional or other personal interest of any nature or kind in any product, service, and company that could be construed as influencing the position presented in, or the review of the manuscript., (© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Yak is an ancient breed and Bazhou Yak is also one of China's unique yak breed resources. In the present study, its complete mitochondrial genome was assembled from Illumina sequencing data and we identified the complete mitochondrial genome of the Bazhou yak ( Bos grunniens ). The complete mitochondrial DNA is a circular molecule with 16,325 bp length consisting of 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes, and a non-coding control region (D-loop). The overall nucleotide composition is A (33.69%), T (27.30%), C (25.79%), and G (13.22%), respectively. The content of C + G is 39.01%. Phylogenetic analysis of the mitochondrial genomes of 15 related species by MEGA7.0 showed that the genetic relationship of Bazhou yak is closer to Datong yak and polled yak., Competing Interests: The authors declare that there are no financial and personal relationships with other people or organizations that can inappropriately influence our work, and no professional or other personal interest of any nature or kind in any product, service and company that could be construed as influencing the position presented in, or the review of the manuscript., (© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)

Jialuo sheep is one of the important production materials of herdsmen in the pastoral areas of northwestern Sichuan in China. We reported the complete mitogenome of Jialuo sheep for the first time. It is 16,617 bp in length, containing 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and a control region (D-loop). In the evolutionary relationship, the mitogenome of Jialuo sheep is closer to Texel sheep. This report will help the further studies of sheep species classification and resource protection., Competing Interests: No potential conflict of interest was reported by the authors., (© 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.)