I buy organic feed and the company I purchase from has just added varieties. Which is best between: soy-free (starting with peas, corn, oats, wheat, etc) or soy and corn-free (staring with peas, oats, wheat, and barley, etc)?
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Humans lack a gizzard full of stones used to grind hard foods such as corn and other whole seeds/grains.
Understanding the systems of a species and how they differ from the systems of other species can go a long way in helping to understand that what is right for one is not right for another.