I use turkey *starter* that's 27% protein, but since a literature recommends lower protein for ducks, I don't like to recommend it. Turkey starter will have 70 ppm niacin which is why I don't have to supplement mine. Turkey grower/finisher does not have 70 ppm niacin, so I don't know if that could be used.What is the protein content? I believe @casportpony uses Turkey starter for all her birds.