Funding for this research was provided by:
gricultural Technology Innovation Projects of Livestock and Poultry Breeding (No)
Text and Data Mining valid from 2018-07-06
Received: 3 January 2017
Accepted: 11 May 2018
First Online: 6 July 2018
Ethics approval and consent to participate
: No applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.