Hi, I am just looking for a refresher on duckling feed. I had two that are just beginning to form angel wing, and I realize their protein levels need to be dropped. I'm getting closer to combing my ducklings with my older ducks who are all laying and eating Mazuri 17% protein 3% calcium layer formula, with a little Purina duck food 19% protein mixed in. Should I switch to a maintenance feed until the ducklings are laying - the Mazuri maintenance is 14% protein. I think that's more in the range I need the ducklings to be in. My layers eat a ton of oyster shells.