In America whole milk has been standardized to 3.25% butterfat. Dairy cows actually produce a higher percentage of butter fat than this. In fact dairy farmers are paid a premium for milk with a higher fat content. The dairies then remove butterfat to achieve the desired level of fat in the milk and sell the cream separately in various products. This chart will show you the composition of raw milk being sold to the dairies by various breeds. [https://queries.uscdcb.com/publish/dhi/current/laall.shtml](https://queries.uscdcb.com/publish/dhi/current/laall.shtml)
The percentages refer to the milk fat content. Depending on the species of cow, natural milk has a fat percentage of about 4-6%, I think 4% being the most common in America. So that is “Whole Milk,” i.e. milk with the whole amount of fat in it. 1% and 2% Milk has had the milk fat content reduced down to 1 and 2%, and Skim Milk has had all milk fats taken out of it. Theoretically, you could possibly make 3% Milk by filtering down to 2% then reintroducing some milk fat back into it, I guess, but that just seems kind of weird.
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