1. Institute of Livestock and Grassland Science; National Agriculture and Food Research Organization (NARO); Tsukuba Japan
2. Animal Research Center, Hokkaido Research Organization; Shintoku Japan
3. Graduate School of Agriculture; Hokkaido University; Sapporo Japan
4. Fukuoka Agriculture and Forestry Research Center; Chikushino Japan
5. Tochigi Prefecture Livestock & Dairy Experimental Center; Nasushiobara Japan