Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2016YFC1202000, 2017YFD0501200)
Text and Data Mining valid from 2019-02-07
Received: 23 June 2018
Accepted: 22 January 2019
First Online: 7 February 2019
Ethics approval and consent to participate
: This study was approved by the Animal Ethics Committee of Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences.
: All of the authors of this manuscript declare that we have seen and approved the submitted version of this manuscript. Not applicable any individual persons data.
: The authors declare that they have no competing interests.