China will impose additional 55% tariffs on beef imports from countries including Brazil, Australia and the U.S. when shipments exceed certain quotas, a major blow to key global suppliers as the domestic industry grapples with a supply glut. China's commerce ministry said on Wednesday the total quota for 2026 is 2.7 million metric tons, with Brazil assigned the highest portion of 41.1%, followed by Argentina with 19.0% and 12.1% for Uruguay.