Toyko-X

Pig

Tokyo-X is a new Japanese breed of domestic pig, bred for high quality pork production. It is unusual for its marbled meat, seldom seen in pork. The Tokyo-X breeding effort was begun in 1990 by the Tokyo Metropolitan Livestock Experiment Station, combining bloodlines from the Duroc (USA), Berkshire (UK), and Beijing Black (China) breeds. Five generations of breeding and selection ended in 1997 when the breed went to market.

http://en.wikipedia.org/wiki/Tokyo-X