As I understand it, there are two big things that american maltsters and continental maltsters look for in grain differently, one is nitrogen content and the other is diastatic power. the high adjust american breweries that have, until recently, set malt production targets here in north america need and very high nitrogen levels and very high diastatic power while the continental all malt breweries see high nitrogen as a real problem and just don't need the high diastatic power so it's not a target for growers and breeders there.