Lower grades of milk are further processed, as in there ain't no such thing as a skim, 1%, or 2% cow.I knew living in Vermont would come in handy some day.EDIT: A review of the literature says that most modern cheeses are made from pasteurized milk (heated to 72C for 15 seconds and rapidly cooled to 4C), and that US raw-milk cheeses must be aged for 60 days before sale.