Whey cheeses are a dairy product made not from whole milk, but from the whey remaining after cheese production.
"...Many cheese products produce in the United States do contain a coagulating enzyme derived from either beef or swine. The process of changing fluid milk into cheese consists of coagulating the milk by one of two commonly used methods, each resulting in cheese having distinct characteristics.
The most common method of coagulating milk is by the use of an enzyme preparation, rennet, which traditionally was made from the stomachs of veal calves. Since the consumption of calves for veal has not kept pace with the demand for rennet in the preparation of cheese, a distinct shortage of this enzyme has developed. Consequently, a few years ago it became a common practice to mix the rennet extract from calves' stomachs with a pepsin enzyme derived primarily from the stomachs of swine. These enzymes convert the fluid milk into a semi-solid mass as one of the steps in the manufacture of cheese. This mixture of calf rennet and pepsin extract is quite commonly and widely used within the United States. [These animal enzymes are found in the 'whey' when it is listed in the ingredients listing of any other product unless it is specified 'milk whey' or 'whey from milk', otherwise it is whey from cheese production.]
A more recent development in this area has been the use of enzymes derived from the growth of pure cultures of certain molds. These are termed microbial rennets. They are commonly used for the production of certain types of cheese and contain no animal products...." [The ingredients list on the cheese will state: 'contains no animal rennet (vegetarian)' or 'microbial rennets'.] (The above 3 paragraphs excerpted from a letter by Kraft called "What's In Your Cheese?" and can be found online in its entirety)
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All cheese is made from the curds of the milk. While the whey is discarded, it's possible that not all of it is removed. So there is probably a little bit in the finished cheese, but it would be very, very little.
After milk has been acidified, rennet is added to the milk. The milk curdles and separate into two substances: whey is the liquid part, while curds are the solid part that is used to make cheese.