I know that ducks mostly forage for food, but what should I add to their diet? I'm planning on raising them for eggs, so I would like them to have the most nutritious/healthiest eggs possible. I read up that feed mostly affects egg quality. Also, I know that seeds are good in small quantities, but what if I grind them up, so they're easier to digest? I would prefer a complex, yet organic feed for my ducks, similar to how Garden Betty made her whole grain chicken feed, with the appropriate protein ratio for them, even though egg-laying ducks probably have a different protein ratio for feed. Essentially, I'm an looking for a varied, feed that is nothing else but the best for my ducks, so I can get healthier ducks, and much healthier eggs! Include anything beneficial, such as small, but nutritious treats.
As a side note, we tend to have very cold winters, but I read up that the ducks could tolerate it. We do get a significant amount of snow, so how should I change the feed to help them over the winter? Or should I just shovel some snow from them to free range on exposed earth?