Is there such a thing as feeding too much protein? I switched to Purina Flock Raiser to get the 20+% protein because my chickens were plucking (eating?) feathers. That didnt' solve the problem but that is a different issue. Should I revert back to Layena in the spring when they start laying more heavily? I have oyster shell always availabe so that is not a consideration. I guess my real question is if there is a reason other than relative cost why you shouldn't always feed a high protein ration.