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
Istrian milk fat and 7% protein. Typically, Istrian Milk sheep produce 100–150 kg of milk per lactation, although studies have found that Croatian Istrian Milk sheep produce substantially more, averaging 205 kg of milk per lactation. There have been attempts to cross the Istrian Milk with the East Friesian in order to increase its milk production. As its name indicates, the Istrian Milk is primarily a dairy breed; however, it is kept for meat and wool as well. Its milk is primarily used for cheese making. Their milk is well-suited for cheese because of the breed's adaptations to its natural habitat, especially