Buffalo mozzarella farms used to produce the PDO buffalo mozzarella DOP. On 19 April, China definitively removed the ban on mozzarella, originally activated on 28 March 2008, and tests held in December 2013 in Germany on behalf of four Italian consumer associations have highlighted dioxin and heavy metal levels at the lowest of five times at most permitted by law. To produce of cheese, a cheese maker requires of cow milk but only of buffalo milk. Producing 1 kg of butter requires of cow milk but only of buffalo milk. The steps required to produce buffalo mozzarella are: The digestive system of
Egyptian cheese or close to it; there was an old dry cheese; and there was a medium one in between." The first would have been unripened cheese made locally from sour milk, which may or may not have been salted. The old dry cheeses would have often been imported, and were cheeses ripened by rennet enzymes or bacteria. The nature of the "medium" cheese is less certain, and may have referred to preserved fresh cheeses, evaporated milk or cheese similar to Indian paneer, where the addition of vegetable juices makes the milk coagulate. Medieval Egyptian cheese mostly used buffalo or cows' milk,