By definition, grass-fed cattle graze in pastures, while conventional cattle are locked into feedlots and fed corn and other grains.
But the U.S. Agriculture Department has proposed a new standard for grass-fed meat that doesn't required animals to be pastured rather than crammed into feedlots, and that has a broad definition of grass which includes such materials as leftovers from harvested crops.
Critics have argued that the proposal will let conventional ranchers claim their beef is grass-fed.
Grass-fed beef is a leaner meat, and is free of the antibiotics typically used in feedlots. There is a high demand for grass-fed beef, and the number of farms raising grass fed cattle has increased from about 40 to about 1,000 in only seven years.
The is the second time that the Agriculture Department has proposed standards that have elicited protests. The Department has received over 17,000 written comments regarding the proposal.