This is a fascinating thread. I love all the direct research you've done, Leslie. Would you mind sharing the nutshell version of your custom recipe? Thank you.
It's an all-purpose poultry pellet, 19% protein. The base is locally grown wheat, peas from the next state over, pumpkin seeds, with a bit of fish meal (local wholesale distributor) for animal protein, Diamond V organic yeast, and some other supplements like you generally find in poultry feed but with consideration for ducks, chicks, breeders & molting birds. It's a lower calcium feed, so we provide oyster shell on the side.
I think I can slightly taste the pumpkin seeds in the eggs, which is super yummy.
We ferment a portion of the feed with a bit of hay pellets. We also offer some dry. We mix the duck's dry feed with scratch to bring the protein down. We limit scratch for the chickens. I usually supplement the chick feed for a bit more protein.
The birds also have access to good pasture and bug forage areas. Providing diverse forage is a whole other thread.