NEW YORK (AP) — Dairy farmers want U.S. regulators to banish the term "soy milk," but documents show even government agencies haven't always agreed on what to call such drinks.

The U.S. Department of Agriculture "fervently" wanted to use the term "soy milk" in educational materials for the public, according to emails recently released in response to a lawsuit. That irked the Food and Drug Administration, the agency that oversees the rule defining milk as coming from healthy cows.

It's "not a trivial decision," the FDA warned in one of the 2011 emails about the USDA's desire to use the term.

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