About the Authors

Yoku Kato

Affiliations Department of Animal Production Science, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, 183-8509, Japan, University Farm, Faculty of Agriculture, Utsunomiya University, Mohka, Tochigi 321-4415, Japan

Yoshikazu Nagao

ynagao@cc.utsunomiya-u.ac.jp

Affiliations Department of Animal Production Science, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, 183-8509, Japan, University Farm, Faculty of Agriculture, Utsunomiya University, Mohka, Tochigi 321-4415, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YK YN. Performed the experiments: YK. Analyzed the data: YK YN. Contributed reagents/materials/analysis tools: YK YN. Wrote the paper: YK YN.