Affiliation: | a Reproductive Biology and Technology Research Team, National Institute of Livestock and Grassland Science (NILGS), National Agriculture and Food Research Organization (NARO), 2 Ikenodai, Tsukuba, Ibaraki 305-0901, Japan b Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan c Research and Education Faculty, Kochi University, Otsu 200, Monobe, Nankoku, Kochi 783-8502, Japan d Department of Animal Science, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan e Laboratory of Embryo Technology, Institute of Biotechnology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam |