The red maine rule is in the shorthorn bylaws which states "Registered Maine-Anjou (with a red color designation) shall enter the American Shorthorn Association Herd Book at the 3/4 level. Maine-Anjou shall receive the prefix MA prior to registration number. Effective August 1, 2008 Maine Anjou shall be considered ShorthornPlus and receive the AR prefix prior to their registration number." There have been many different red maines that have been used and the most popular is Cunia which is the grandsire to CF Trump. This is a very old rule and when it was made they believed that the red maines had some shorthorn in them which would qualify them. Today with tech. and knowledge of blood lines we know that this is not true anymore but it is still a rule.