If your feed is certified organic, then it meets CNG standards. If your livestock are pasture-raised and don’t receive supplemental feed then you’re probably good to go, so long as you don’t add synthetic fertilizers to your own fields! If you buy from a local supplier, we recommend you show them the CNG Feed Declaration (required of all CNG livestock producers) and see if they can affirm those requirements are met. If you are having difficulty locating feed that meets CNG standards, you might get some leads from this preliminary list of feed suppliers.