1. Laboratory of Animal Reproduction, Faculty of Bioscience and Bioindustry, Tokushima University, Tokushima, Japan
2. Faculty of Veterinary Science, Vietnam National University of Agriculture, Hanoi, Vietnam
3. Faculty of Veterinary Science, Prince of Songkla University, Songkhla, Thailand
4. College of Agricultural Science, Guangdong Ocean University, Guangdong, People’s Republic of China
5. School of Biological Science, Tokai University, Sapporo, Japan