I am ;limited to what I can get now with out driving 50miles round trip. so I am just feeding a non gmo feed. This feed store and we only have 1 use to sell Purina Flock Raiser and that is what I bought. They only sell Tucker non GMO or southern states. Not much of a choice. So I buy the Tucker. I think staying with the all flock is def your best choice. Never heard of any one using it having any health problems from their ducklings or chicks. And if you have any question. Purina will answer any you have.