The rule, now in the public comment period, defines ‘Product of USA’ as coming from animals born, raised and processed in the U.S.

The U.S. Department of Ag­­riculture (USDA) last week ap­­proved a rule that says meat and eggs sold as “Product of USA” or “Made in the USA” must come from animals that were born, raised, processed and sold in the U.S.

The rule aims to clarify the origin of products sold in the U.S....