1. Department of Food and Nutrition, Korea University, Seoul 136-703, Korea; Department of Food and Biotechnology, Korea University, Jochiwon 339-700, Korea; Busan Regional Food and Drug Administration, Busan 608-829, Korea; Livemax Inc., Seongnam 463-420, Korea; National Institute of Subtopical Agriculture, Jeju 690-150, Korea; and Hanwoo Experiment Station, National Institute of Animal Science, Pyongchang 232-952, Korea