1. Department of Animal Bio-system Science; College of Agriculture and Life Sciences; Chungnam National University; Yuseong-gu Daejeon 305-764 Korea
2. Agricultural Research Station; Fort Valley State University; Fort Valley GA
3. Department of Pharmacology Science; College of Pharmacology; Chungnam National University; Yuseong-gu Daejeon 305-764 Korea
4. National Institute of Animal Science; Rural Development Administration; Jeonju Korea