My chickies are picky.
We feed them kitchen scraps, stale leftovers, dandelions, slugs, snails, and other creepy-crawlies, and mixed chicken feed. They really don't like the feed much. They don't like wheat or cracked corn. They don't like bread much.
They seem to like Millet. I keep looking for huge bags of mostly-millet birdseed. They like to run around loose looking for millipedes, seeds, and bugs.
They like rice. I've given them weevily cooked rice before, and they love it. But I'm all out.