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A mix of barley, peas and flax grows in a field at Casey Bailey's farm near Fort Benton, Mont. Bailey sells this crop to Montana dairy farmer Nate Brown, who has been feeding it to his goats. Casey Bailey hide caption

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Casey Bailey

Soybean plants, with pods ready for harvest, in Boonsboro, Maryland. Edwin Remsburg/VW Pics/UIG via Getty Images hide caption

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Edwin Remsburg/VW Pics/UIG via Getty Images

The Soybean Is King, Yet Remains Invisible

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At the Iowa State University Beef Nutrition Farm, the cattle eat carefully formulated rations. Researchers there are trying to test new types of animal feed. Amy Mayer/Iowa Public Radio hide caption

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Amy Mayer/Iowa Public Radio