J Yamada1, Y Tomita1,2. 1. a Laboratory of Food Science, Faculty of Education , Yamaguchi University , 1677-1 Yoshida , Yamaguchi 753 , Japan. 2. b Laboratory of Animal Nutrition and Biochemistry, Faculty of Agriculture , Miyazaki University , Nishi 1-1, Gakuen Kibana-dai , Miyazaki 889-21 , Japan.