1. Department of Animal Production Science, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
2. University Farm, Faculty of Agriculture, Utsunomiya University, Tochigi 321-4415, Japan
3. Division of Regenerative Medicine, Jichi Medical University, Tochigi 329-0498, Japan
4. Basic Science related to Nursing, School of Nursing, Jichi Medical University, Tochigi 329-0498, Japan
5. Animal Research Center, Agricultural Research Department, Hokkaido Research Organization, Hokkaido 081-0038, Japan
6. National Livestock Breeding Center, Fukushima 961-8511, Japan
7. Department of Health and Environmental Science, School of Veterinary Medicine, Rakuno Gakuen University, Hokkaido 069-8501, Japan
8. Department of Animal Science, Faculty of Agriculture, Utsunomiya University, Tochigi 321-4415, Japan