Funding for this research was provided by:
National Natural Science Foundation of China (31372305)
Agricultural Science and Technology Innovation Program (ASTIP-IAS04, ASTIP-IAS-TS-18)
Earmarked Fund for Modern Agro-Industry Technology Research System (CARS-41)
Chinese Academy of Agricultural Sciences Institute of Animal Sciences Basic Research
Received: 2 May 2018
Accepted: 30 October 2018
First Online: 26 November 2018
: All experimental procedures with chickens were performed according to the Guidelines for Experimental Animals established by the Ministry of Science and Technology (Beijing, China). Ethical approval on animal survival was given by the animal ethics committee of the Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS, Beijing, China).
: Not applicable.
: The authors declare that they have no competing interests.
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