Should Canada maintain its supply management system that protects the Canadian dairy industry? Poll: Supply managementPhoto: The Canadian Press/Christinne Muschi Cows graze on a dairy farm in Granby, Que., on Thursday, July 23, 2026. The supply management system that protects Canadian dairy has been cited by the U.S. as a key irritant in trade negotiations and Trump has repeatedly complained about the level of U.S. dairy farmers' access to Canada's market. Dairy Farmers of Canada says it's urging the federal government not to offer any more concessions on dairy or supply management in talks with the United States. Prime Minister Mark Carney said Thursday his government is "loyal" to the supply management system.