1. Swine and Poultry Department; Shizuoka Prefectural Research Institute of Animal Industry; Swine and Poultry Research Center; Kikugawa Shizuoka Japan
2. School of Agriculture; Tokai University; Kumamoto Japan
3. Animal Genome Unit; Division of Animal Breeding and Reproduction; Institute of Livestock and Glassland Science; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan