There are over 800 breeds of cattle. popular breeds are Holstein-Friesian and Brown Swiss and they're used for milking. Also, angus and hereford are some popular breeds raised for beef.
There are over 50 breeds of cattle popular in the U.S. The most popular is the Angus because it's a sturdy beed with few problems and has the best beef. Another, the Ayrshire, is a top milk producer.