Hello: From day one I have always had all my chickens (different aged) together and never have had any issues... I have 1 month olds -5 months old but all the older ones are hens no roos. We also have 2, 5 week old pekin ducklings in with them since we currently only have 1 large pen. The ducks grew up with the chickens, specifically 2 really cool silkies and they are inseparable so I never thought that I would have to separate them. They all eat the same food for now until we make 2 more pens, 1 for silkies and 1 for polish. We are feeding medicated chick started... -Is that okay to feed ducklings too? 5 week olds... -I was told it would be okay to feed the older chickens (4-5 months old) until the younger ones get to be around 3 months old, is that true? I was told that the ducks need more protein and the older chickens need more calcium. Sooo, can they all be on the same food ever? Can maybe a add in treats that the ducks get more then the chickens and vise versa? I know oyster shells are good for calcium but can the others eat them or should I feed them some twice a day without the younger ones and the ducklings getting any...I know I can feed crickets to the ducks for protein. The ducks eat lots of peas and corn, does that have protein? I just want to make sure they are all getting something that wont hurt them... What will it do if they continue to get chick started until I have no more younger chicks outside? Any suggestions?