I love lamb chops but I am not a huge fan of mutton. Still, adult sheep should have a chance to drop either lamb chops or mutton.
I apologize for the "necro" but the part of the rules I read said not to make duplicate threads. Maybe baby lambs drop 0-1 lamb chops and adult sheep drop 1-2 mutton chops? That is new info! My reasoning is also that livestock should have a reason to be bred and slaughtered.