1. Gyeongsangbuk-Do Livestock Research institute, Yeongju 36052, Korea
2. Center for Bio-Medical Engineering Core Facility, Dankook University, Cheonan 31116, Korea
3. Department of Microbiology, Dankook University, Cheonan 31116, Korea
4. Korea National College of Agriculture and Fisheries, Jeonju 54874, Korea