1. Department of Animal Nutrition and Feed Science, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia
2. Sumiyoshi Livestock Science Station, Field Science Education Research Center, Faculty of Agriculture, University of Miyazaki, Shimanouchi 10100-1, Miyazaki, 880-0121, Japan
3. Faculty of Agriculture, University of Miyazaki, Gakuen kibanadai Nishi 1-1, Miyazaki, 889-2192, Japan