Researchers from the United Kingdom trained dairy cattle to prefer a “highly palatable feed” (a pelleted grain containing molasses) rather than a “low palatability feed” (comprised of rolled barley and soybean meal). Next they gave the cows a choice between the two feeds.
However, during the actual experiment there was a catch, explains Rick Grant, president of the W.H. Miner Agricultural Research Institute in Chazy, N.Y. The highly palatable feed came with a dominant cow feeding in close proximity while the subordinate cows could eat the low palatability feed alone.
Source: Miner Institute July 2012 Farm Report