1. Graduate School of Animal Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Inadacho, Nishi 2 Sen-1, Obihiro 080-8555, Hokkaido, Japan
2. School of Food and Nutrition Sciences, Jomo Kenyatta University of Agriculture and Technology, Nairobi P.O. Box 62000-00200, Kenya
3. Faculty of Agriculture and Environmental Science, Universite Évangélique en Afrique, Bukavu P.O Box 3323, Sud-Kivu, Democratic Republic of the Congo