U.S. labeling rules cost Canada hog farmers $2 billion

U.S. country-of-origin meat-labeling rules have directly cost Canada's hog and pork industry more than $2 billion, according to a report that could help determine retaliation against U.S. exports if Washington does not change its requirements.

The United States must bring the labeling rules, known by the acronym COOL, into compliance with a World Trade Organization ruling by May 23, 2013, according to a WTO decision released last month.