1. Key Lab of Animal Cell Biotechnology, National Institute of Animal Science, Hanoi, Vietnam
2. Division of Animal Sciences, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Ibaraki 305-8602, Japan
3. The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi 753-8515, Japan
4. Animal Breeding and Reproduction Research Division, Institute of Livestock and Grassland Science, NARO, Ibaraki 305-0901, Japan