While the chickens and ducks are free to eat grasses and bugs and whatever they want out on pasture, year-round, they do also enjoy a bit of supplemental food.
We've always given them organic food to eat, but for the past year or so, we've been feeding them Scratch and Peck starter, grower, or layer feed, depending on their age and needs. Scratch and Peck is sourced in the Pacific North West, is organic, and - because the folks at S&P know the farmers - is certified GMO-free.
No soy. No corn. Just high-quality, whole grains (the starter feed is cracked) and peas, with supplements and minerals as needed by age.
And all the bugs and grasses they want!