1. Department of Animal Science; College of Agriculture and Life Sciences; Gyeongsang National University; Jinju 660-701 Korea
2. Institute of Agriculture and Life Science; Gyeongsang National University; Jinju 660-701 Korea
3. Division of Applied Life Science; Gyeongsang National University; Jinju 660-701 Korea
4. Department of Animal Science; Pusan National University; Miryang 627-706 Korea