1. Department of Food and Biotechnology, Korea University, Chungnam 339-700, Korea
2. Institute of Nano-Bio Technology, Ewha Womans University, Seoul 120-750, Korea
3. Dairy Science Division, National Institute of Animal Science, Chungnam 331-800,
Korea
4. Department of Animal
Science, Chonbuk National University, Jeonbuk
561-756, Korea