Funding for this research was provided by:
Modern Agricultural Industry Technology System (CARS-36)
Developing key equipment for digital management and monitoring environment in animal production (2013AA10230602)
National Natural Science Foundation of China (31372317)
111 Project (B16044)
Text and Data Mining valid from 2018-05-16
Received: 19 October 2017
Accepted: 13 April 2018
First Online: 16 May 2018
Ethics approval and consent to participate
: All procedures used in this study were performed according to the guidelines for the ethical treatment of animal by the Institutional Animal Care and Use Committee of China Agricultural University (Beijing, China).
: The authors declare that they have no competing interests.