Funding for this research was provided by:
Key agricultural science and technology innovation Program of Shaanxi Province in China (No. 2016NY-102)
Received: 20 November 2018
Accepted: 14 May 2019
First Online: 22 May 2019
: All the animal procedures were carried out in accordance with the Guide for the Care and Use of Laboratory Animals (Ministry of Science and Technology of China, 2006). All animal experiments were approved by the Experimental Animal Management Committee of Northwest A&F University 142.
: Not applicable.
: The authors declare that they have no competing interests.
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