Funding for this research was provided by:
National Natural Science Foundation of China (31601978)
China Agriculture Research System – Beijing Team for Poultry Industry
Priority Academic Program Development of Jiangsu Higher Education Institutions
Received: 13 October 2017
Accepted: 6 April 2018
First Online: 9 May 2018
: This manuscript does not involve any human subjects or human data. All experimental procedures were approved by the Animal Care and Use Committee of the Feed Research Institute of the Chinese Academy of Agricultural Sciences.
: This manuscript does not contain any individual personal data.
: The authors declare that they have no competing interests.