Kan. Admin. Regs. § 4-3-10
Urea and ammonium salts of carbonic and phosphoric acids are acceptable ingredients in proprietary cattle, sheep and goat feeds only; that these materials shall be considered adulterants in proprietary feeds for other animals and birds; and that the following statement of guaranty of crude protein for feeds containing these materials be used:
Crude Protein, not less than ______ percent. (This includes not more than ______ percent equivalent protein from nonprotein nitrogen.)
If feed contains more than three percent of urea, or if the equivalent protein contributed by urea exceeds 1/3 of the total crude protein, the label shall bear a statement of proper usage, and the following statement in type of such conspicuousness as to render it likely to be read and understood by ordinary individuals under customary conditions of purchase and use:
WARNING: This feed should be used only in accordance with directions furnished on the label.
Kan. Admin. Regs. § 4-3-10