1. Department of Animal Science; Chungbuk National University; 28644 Cheongju Korea
2. Swine Science Division; National Institute of Animal Science; Rural Development Administration; Chunan 31000 Korea
3. Department of Animal Biotechnology; Chonbuk National University; Jeonju 54896 Korea
4. Recombinetics; St. Paul MN; 55104 MN USA
5. Jung Pig and Customer Institute; Young-In 16950 Korea