Blue cheese of blue veins. The distinctive flavor and aroma of blue cheese arises from methyl ketones (including 2-pentanone, 2-heptanone, and 2-nonanone) which are a metabolic product of "Penicillium roqueforti". These compounds are not formed in other types of cheese fermented by bacterial acidification alone. In the European Union, many blue cheeses, such as Cabrales, Danablu, Gorgonzola, Roquefort and Blue Stilton, carry a protected designation of origin, meaning they can bear the name only if they have been made in a particular region. Similarly, individual countries have protections of their own such as France's Appellation d'Origine Contrôlée and Italy's Denominazione di Origine
Maytag Blue cheese Maytag Blue cheese Maytag is a blue cheese produced on the Maytag Dairy Farms outside of Newton, Iowa, the former home of the Maytag Corporation. In 1938, Iowa State University independently developed a process for making blue cheese from homogenized cow's milk instead of the traditional sheep's milk. In 1941 production of the cheese was started by Frederick L. Maytag II and Robert Maytag, grandsons of the founder of the Maytag appliance company, Frederick Louis Maytag I. The milk for the cheese initially came from a prize-winning herd of Holstein cattle that was established by E. H. Maytag, a son