The manufacturer of a custom-mixed feed is not responsible for the nutritional adequacy of that feed, provided that the manufacturer makes no claim of nutritional adequacy. The manufacturer of a custom-mixed feed may place a disclaimer on the feed label stating that the manufacturer does not claim or warrant the nutritional adequacy of the feed, or the suitability of the feed for its intended purpose.
Wis. Admin. Code Department of Agriculture, Trade and Consumer Protection ATCP 42.26