Funding for this research was provided by:
Agriculture Research System of China (CARS-42-4)
National Natural Science Foundation of China (31772576, 31522055)
Project of National Science and Technology Plan for Rural Development in China (No. 2015BAD03B06)
Received: 16 November 2018
Accepted: 3 May 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: All animal handling procedures were approved by Sichuan Agricultural University Animal Welfare Committee under DKY20150913.
: Not applicable.
: The authors declare that they have no competing interests.
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