(AP) -- The Obama administration is calling for stricter labels on fresh meat and other foods that would show more clearly where an animal or food came from.

The move comes as Obama prepares to visit Canada — a longtime opponent of the so- called "country of origin" labels — on Thursday. Both Canada and Mexico have protested the labeling in a complaint to the World Trade Organization.

Agriculture Secretary Tom Vilsack told consumer groups, farm groups and meat industry leaders Tuesday that he will ask the meat industry to voluntarily follow stricter guidelines for new package labels designed to specify a food's country of origin. The Agriculture Department abruptly canceled a scheduled announcement of the decision Wednesday morning, with little explanation.

In calling for the stricter guidelines, the Obama administration would be breaking from rules announced by the Agriculture Department shortly before President George W. Bush left office. Supporters of the labeling law — first enacted in a wide-ranging farm bill last year — were not happy with the Bush administration's version of the rules, which they said allowed meat companies to be vague about where an animal was born, raised and slaughtered.

If the industry does not comply with the stricter guidelines, the administration will write new rules, according to those who spoke with Vilsack on Tuesday.

The labeling requirements, which would apply to fresh meats and some perishable fruits and vegetables, have long been debated in Congress. While the meat industry and retailers responsible for the labels have protested the changes — saying they are burdensome and could lead to higher prices — consumer groups and northern state ranchers who compete with the Canadian beef industry favor them.

All sides worked out a compromise during debate over the farm bill last year, but much of the law was left open to interpretation by the Agriculture Department.