1. Program of life and environmental Science, Graduate School of Integral Science for Life, Hiroshima University, 1-7-1, Kagamiyama, Higashi-hiroshima, Hiroshima 739-8521, Japan
2. National Institute of Information and Communications Technology, Advanced ICT Research Institute, 588-2, Iwaoka, Nishi-ku, Kobe 651-2492, Japan
3. Institute of Animal Husbandry, Heilongjiang Academy of Agricultural Sciences, Xuefu Road No. 368, Nangang District, Harbin, Heilongjiang 150-086, China