NPR has a good story on the disappearance of Argentina’s grass-fed beef and the move to feed lots due to the soaring price of soybeans and farmers move to that crop from beef. The bigger problem – there is no way to tell what beef is feedlot and what beef is grass-fed as it’s not identified by production method.
This is quickly leading to an end of Argentina’s reputation for amazing beef, but Uruguay is increasing it’s grass-fed beef production, so maybe we’ll have to head across the border.