Funding for this research was provided by:
National Natural Science Foundation of China (31760702, 31360577)
Project of the Innovation Team on Gansu Grassland and Animal Husbandry Sustainable Development (2017C-11)
National Key R&D Program of China (2018YFD0502402-3)
Article History
Accepted: 25 December 2019
First Online: 1 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.