Well, I know a person that feeds a grain mix that is from a feed lot. I know it has wheat in it. I mix grains into my Premade feed for my Ducks.
Wild bird seed also.
I think I found pre-made mix that seems all right. May be twice a week I will give them whole grain mix after 3 days of fermentation. Ducks are picky eaters, at least my are.
Thank you