The Japanese Black, also known as the Wagyu, is the most common beef cattle breed in Japan. Known for its superior ability to produce marbled beef, the Japanese Black is a very pure breed; no foreign genes have been introduced into Japanese Black breeding stock in Japan for over a century [1]. Production of this breed is expensive, and the value of a Japanese Black calf is about four times that of a Holstein-Friesian calf [2]. Recently, the price of Japanese Black calves has gradually increased because of a decline in the number of cow-calf operations.