1. Animal Breeding and Reproduction Division; NARO Institute of Livestock and Grassland Science; Tsukuba Ibaraki Japan
2. Animal Development and Differentiation Research Unit; National Institute of Agrobiological Sciences; Tsukuba Ibaraki Japan
3. Laboratory of Reproduction Biotechnology; Applied Embryology and Stem Cell Research Team; Agricultural Biotechnology Center; Godollo Hungary
4. Institute of Animal Husbandry; Szent István University; Godollo Hungary