It comes form the "feed" which the cow is given. Mostly plants, which are high in protein.
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Milk tests positive for protein because it naturally contains two main types of protein: casein and whey. These proteins can be detected using specific testing methods like the Kjeldahl method or the Bradford assay. The presence of these proteins makes milk a good source of dietary protein.
Yes, the biuret test will indicate the presence of peptides. If it turns violet, it is a positive result.
Cow's milk is the richest in protein among commonly consumed animal milks, with about 8 grams of protein per 1 cup serving. Sheep and goat milk also contain high amounts of protein, with sheep milk having slightly more protein than goat milk.
This may be wrong but I think you could use the biuret test as this would only give a positive result in the test tube with protein in
in biuret test the presence of peptide bonds gives a violet color. but it should be noted that a minimum of two peptide bonds should be present in the protein to get a positive answer to this test.
Any food that has carbohydrate, protein, and fats can be shown positive for those food test. It is basically a chemical reaction that indicate the presence of food component by a specific color formation.