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Those are Holderreads home mix recipies which are mixing things like corn, soybean meal, alfalfa, and bone meal with the brewer's yeast. If you have a feed designed for chicks or turkeys you probably don't need to add as much as 5% brewer's yeast in because some amount of the nutrients are already supplied. The good thing about brewer's yeast is that, being food based, it is a relative safe source of nutrients, you don't need to worry much about overdosing. We aren't being super scientific here, adding SOME brewer's yeast is probably helpful and certainly can't hurt.