Funding for this research was provided by:
National Natural Science Foundation of China (31402056)
Youth Talent Project in Hebei Province (BJ2014048)
Text and Data Mining valid from 2018-12-01
Received: 8 November 2017
Accepted: 21 November 2018
First Online: 28 December 2018
: Animal studies were approved by the Animal Care and Use Committee of Langfang Normal University, Langfang, Hebei, China. We obtained written permission from the owner of the cattle to take samples.
: Not applicable.
: The authors declare that they have no competing interests.
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