The term MILK COW is used to refer to two different breeds of cows, the Holstein and the JERSEY. The Holstein is an 8-letter breed of dairy cow that is known for its black and white spotted coat and its high milk production. The JERSEY is a 6-letter breed of dairy cow that is known for its brown and white coat and its high butterfat content in its milk. Both breeds are popular for their milk production and are used in dairy farming around the world.