About the Authors

Nan Liu

Affiliation Institute of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China

Yingjun Zhang

zhangyj@cau.edu.cn

Affiliation Institute of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China

Shujuan Chang

Affiliation Institute of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China

Haiming Kan

Affiliation Institute of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China

Lijun Lin

Affiliation Institute of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NL YJZ. Performed the experiments: NL HMK. Analyzed the data: NL. Contributed reagents/materials/analysis tools: NL LJL SJC. Wrote the paper: NL.