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It's not a bad idea to change over slowly, so maybe start adding a quart of the 15% to a gallon of 30% and then increase the mix until you are at half and half after a week or so. But they'll most likely be fine either way. -Wendy

I raise my FR's on Purina Flock Raiser which is 20% protein from start to finish (9-11 weeks). In your situation, I'd simply mix the 15% and 30% feeds half and half. Chickens are pretty hard to mess up, they'll eat just about anything and do fine. :) -Wendy