Text and Data Mining valid from 2019-03-04
Received: 27 September 2018
Accepted: 14 January 2019
First Online: 4 March 2019
Ethics approval and consent to participate
: Animal experiments were approved by the Science Research Department of the Institute of Animal Sciences, Chinese Academy of Agricultural Sciences (CAAS) (Beijing, China). There was no use of human participants, data or tissues.
: Not applicable.
: The authors declare that they have no competing interests.