Funding for this research was provided by:
National Basic Research Program of China (973 Program) (2017YFD0500500)
National Natural Science Foundation of China (31472122, 31672451)
Text and Data Mining valid from 2019-12-01
Received: 16 December 2019
Accepted: 19 December 2019
First Online: 28 December 2019
Ethics approval and consent to participate
: All of the calves and the experimental protocol in this study were approved by the Institution Animal Care and Use Committee of the Northwest A&F University (protocol number NWAFAC1008). Authors declare no ethical problems.
: All authors gave their consent for publication.
: The authors declare that they have no competing interests.