Pasteurized milk from dairy cows contains the protein s-lactoglobulin (BLG), which is not present in human milk. Because it’s a major milk allergen, an attempt at decreasing BLG by engineering genetically modified cows has gained much attention recently in the science community. According to a recent study, Analysis of hormonally induced milk from [these calves] demonstrated absence of BLG and a concurrent increase of all casein milk proteins.
“It is believed that if bred in sufficient numbers, these type of genetically modified cows could one day provide milk for allergic infants and adults.”
Of course, this isn’t even an issue when milk isn’t pasteurized, but that’s another topic completely!