RCC Shigefuku 059 is sired by the original Shigefuku, the highest content Kedaka bull ever to leave Japan. Shigefuku himself did not leave Japan; only a small amount of semen made the voyage. Shigefuku is a son of Dai 20 Hirashige 287 and is a half-brother to the greatest bull in Japan, Hirashigekatsu. Hirashigekatsu is producing heavy carcasses with extreme marbling. At the 2007 all Japan Zenkyo competition, six of the top ten bulls were sired by Hirashigekatsu.
Toshiro bull is son of LMR Toshiro 1/3, who is a 1900 pound bull from the Lone Mountain program. LMR Toshiro 1/3 traces back to Kitaguni 7/8, one of the most famous Japanese sires through his Dam, World K’s Reiko, who is another great female of the breed.
Toshiro’s sire, LMR Toshiro 1/3 has an average hanging carcass weight of 1030 pounds and 30.51% IMF. His dam is Kobe Mizutani 17W, who currently weighs 1540 pounds.