1Department of Pharmacology & Toxicology, College of Veterinary Medicine, Gyeongsang National University (Institute of Animal Science), Jinju 660-701
2Gyeongnam Livestock Promotion Institute Middle-branch, Changwon 541-703
3Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology, Jinju 660-758
4Department of Microbiology & Immunology, College of Veterinary Medicine, Gyeongsang National University (Institute of Animal Science), Jinju 660-701, Korea