Why doesn’t “milk” need to specify that is it “dairy milk” or “cow’s milk”?
“Milk” has a standard of identity at 21 CFR 131.110. Part of the standard of identity (which is the federal definition) of “milk” is that it obtained from cows. Adding “dairy” or “cow’s” in front of “milk” is not necessary because the definition for this product already includes cows as the source. The standard of identity for milk reads… “Milk is the lacteal secretion, practically free from colostrum, obtained by the complete milking of one or more healthy cows.” There is additional information about the composition of this product (fat and milk solids) as well.