[Nirvana]

Even before FDA prohibited feeding protein derived from ruminants, other than blood products, to ruminants in August 1997, only small amounts of animal proteins were fed to ruminants in the United States, primarily to dairy cattle, because of the relatively high cost of this type of feed. Range cattle, which are on pasture most of their lives, typically receive little protein supplement of any kind.


http://www.cattlenetwork.com/content...ntentid=250926