Funding for this research was provided by:
Agro-Industry Research and Development Special Fund of China (CARS-40-K12)
National Key R&D Program of China (2017YFD0500500)
Beijing Innovation Consortium of Agriculture Research System (BAIC04-2018)
Agricultural Science and Technology Innovation Program (ASTIP) of the Chinese Academy of Agricultural Sciences (ASTIP)
Received: 17 October 2019
Accepted: 13 January 2020
First Online: 10 March 2020
: All experimental protocols for this study were approved by Animal Care and Use Committee of the Feed Research Institute of the Chinese Academy of Agricultural Sciences in accordance with the Chinese guidelines for animal welfare and experimental protocol.
: Not applicable.
: The authors declare that they have no competing interests.