^○HIRUMACHI KEITA¹, SABURI JUNICHI¹, OSAWA TAKEFUMI¹, SASAKI OSAMU², OKA TARO³ (1.National Livestock Breeding Center, 2.National Agriculture and Food Research Orgnization, 3.The Holstein Cattle Association of Japan)

^○Inoue Keiichi, Hosono Masahiko, Oyama Hidemi (National Livestock Breeding Center)