The difference between Dutch Cowlan and a2 milk powder. Dutch Cowlan and a2 milk powder are two of the more popular infant milk powder brands on the market. But what are the differences between them? Dutch Cow Barn is a long-established brand originating from the Netherlands, while a2 milk powder is a relatively new brand that mainly uses pure natural a2 milk powder as its main ingredient. The manufacturer of the Dutch cattle pen is the Dutch company Ferrich, and the manufacturer of a2 milk powder is