http://fineartamerica.com/images-med...ryl-poland.jpg
Just don't try it with beef breeds! The one in the above link is a Hereford, which are usually red, sometimes black, but pretty much always have the high-white face. By far the most popular breed for foundation stock seems to be the Brahma, recognizable by their shoulder hump and drooping ears.
https://s-media-cache-ak0.pinimg.com...4ef7c6f8d0.jpg
...And impressive flexibility & hang time!