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Article History

Received: 24 June 2019

Accepted: 26 November 2019

First Online: 5 December 2019

Ethics approval and consent to participate

: Animal management and use procedures were performed in accordance with the guidelines and regulations of the animal ethics committee of Northwest Agriculture and Forestry (A&F) University, Yangling, Shaanxi, China. The whole study, including the animal use protocol, was approved by the Animal Use and Care Committee of Northwest A&F University (NWAFAC3751). The animal use in this study was consented by each of the 4 dairy farms in writing.

: Not applicable.

: Eveline M. Ibeagha-Awemu is a member of the editorial board for BMC Genomics. All other authors declare no competing interests.