1. University Farm, Department of Agriculture, Utsunomiya University, Mohka, Japan
2. Department of Animal Production Science, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Japan
3. Marubeni Nisshin Feed Co., LTD, Chuo-ku, Tokyo, Japan
4. The Research Center for Animal Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan