I have 5 WH ducks and one drake. Also have one Tufted Buff goose( my gander died leaving me with only the goose) They are fifteen weeks old. I have fed TSC Dumor feed since I got them and added Brewer's Yeast until they were around 8 weeks old. I cannot say enough about how I HATE TSC! I also have chickens and in just this short period of time I have bought at least 3 bags of feed that had some kind of nasty moldy CRAP in it. That plus the fact that my closest TSC has truly uncaring and at times smart alecky employees....I decided I would not go back. That left me with the Farm Bureau which is a Southern States. The only feed they carry with the lower protein level (I think it was 14%) is also a layer feed with 3.45% calcium. A local friend facing the same problem says she has been feeding that to her chickens and ducks, hens, roosters, drakes....everybody for a couple years with no problems. She is mixing it 50/50 with a bag of scratch grains. Last week I decided to do the same and bought 1 bag of each. Ducks and chickens all seem to like it and seems to be no problems switching over. But the more I read the more I am freaking over my roosters and my drake getting unneeded calcium. Any suggestions? I have had NO health issues with any of my flock to this point. And I have read what everyone feeds till it is all running together. It is hard to believe I am in a farming county and still don't have better choices. Unreal. But I think ducks just get left out in the whole scheme of things.