12/19/2013 11:32 am ET Updated Jan 23, 2014

5 Surprising Things We Feed Cows

Lester Lefkowitz via Getty Images

In addition to the old standbys of corn, soy, hay (and, uh, drugs), "There's a lot of stuff which the general public might not think of as feeds which are actually quite common," says Cory Parsons, a livestock nutrition expert at Oregon State University. For example...

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