The term “grassfed” is a voluntary standard regulated by the USDA Agricultural Marketing Service. It requires that grass and forage be the feed source consumed for the lifetime of the ruminant animal, with the exception of milk consumed prior to weaning. Grassfed animals must have continuous access to pasture during the growing season and cannot be fed grain or grain byproducts. An exception to this standard exists where adverse environmental or physical conditions may be harmful to the animal; for the well-being of the animal, feed supplementation may be allowed. Such supplementation requires the producer to provide full documentation to the USDA.
Material excerpt from “Decoding our Food Supply”, Grit Magazine, December 2014