While attending the 2011 IFAJ Congress in Canada I recorded a presentation by Richard Doyle, Executive Director, Dairy Farmers of Canada and President, International Dairy Federation. He’s pictured in the center of the photo. The panel was labeled, “Canadian Agriculture 101.”
A big part of Richard’s presentation deals with the supply management system in Canada that is “based on planned domestic production, administered pricing and dairy product import controls.” There are licensed quotas and various other components to the system which you can read about in this pdf. A good source of information is the Canadian Dairy Information Centre. They national system was introduced in 1970. Listen to his presentation here: Richard Doyle Presentation