According to Food Standards Australia New Zealand (FSANZ), certain breeds of cows, such as Friesians, produce mostly A1 milk, whereas other breeds, such as Guernseys, as well as sheep and goats, produce mostly A2 milk.
According to Food Standards Australia New Zealand (FSANZ), Milk contains many types of proteins. Certain breeds of cows, such as Friesians, produce mostly A1 milk, whereas other breeds, such as Guernseys, as well as sheep and goats, produce mostly A2 milk.