GENEVA -- The U.S. lodged an appeal on Nov. 28 to challenge a World Trade Organization ruling it says failed to bring its meat labeling laws into line with global trade rules.
Canada and Mexico won a WTO ruling three years ago that said the U.S. rules illegally discriminated against imported meat.
The U.S. lost a subsequent appeal and was told to bring its laws into line, but in October this year, the WTO said it had not done so, paving the way for Canada and Mexico to demand the right to impose trade sanctions.
Canadian Agriculture Minister Gerry Ritz said Ottawa was deeply disappointed by the appeal and called on the U.S. to drop its "blatantly protectionist" labeling rules.
"We will take whatever steps may be necessary including retaliation to achieve a fair resolution," he said in a statement.
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Canada estimates the U.S. rules, which require retailers to list the country of origin on meat, cost its farmers and processors $1 billion a year in lost sales and lower prices.
Ottawa already has published a hit list of potential U.S. targets including wine, chocolate, ketchup and cereal.
Even if the latest U.S. appeal fails to overturn October's ruling, it will delay the threat of sanctions, which would only be imposed if the United States failed to bring its laws into line with the WTO rules within a reasonable period.
After that, Mexico and Canada could ask the trade body to let them impose a certain degree of trade sanctions on the United States, which in turn can challenge such a ruling.
Mexico has said it would seek "hundreds of millions" of dollars if the United States does not change its rules.