[[[[......Blues, what do you feed?.....]]]]
I buy "turkey" feed from a local mill. Whole grain wheat and soybean with vitamins and mineral ground and pressed into a pellet. It's 20%. Then they get oyster shell because the feed doesn't have any added calcium. I don't have a lot of feed options around here. Nothing sold is made for ducks.
Then my ducks get greens and fruit. Rarely, they get a small amount of whole grain bread. They refuse to eat white bread. I add a pinch of flax seed to their feeder.
In summer, they get all the greenery and bugs they can harvest. There's nothing but bare ground around here in winter, so in winter, they get a small amount of dry cat food for their animal protein. Every now and again, I crush up a niacin tablet and add it to their water.
I'd rather feed a complete feed made for ducks, but can't get any. My ducks all look good, feathers are so hard and well oiled that the ducks feel like they are armor plated. I have to be careful of their weight. They would very much like to be too fat, so I weigh their food to control their intake.
The geese are on the same sort of diet. They aren't bug eaters, but they still get the cat food and love it.
I've bought grass pellets and alfalfa pellets, but neither the ducks nor the geese will eat them. Collard greens are a huge hit, though.