My grandmother used to make mince meat pies with venison, raisins, etc. at Thanksgiving. One does not see mince meat pies with meat nowadays. Long gone. She had seven older brothers who served in the army during the American civil war.
Minced meat can refer to any ground meat but 'mince' also means a particular way of cooking minced beef as part of a meal. Google 'mince and tatties' and you'll get a good idea. Far more common than guga.