It appears unhyphenated on the US Department of Agriculture's food labelling website.
https://www.fsis.usda.gov/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/food-labeling/meat-and-poultry-labeling-terms/meat-and-poultry-labeling-terms/
This post was edited by Livvie at February 3, 2017 10:51 PM MST