Some answers to you guy's questions.
No till seed mix for wildlife-----
Nope I turn the soil over, 1 shovel deep and then break it up with a long tine rake. Cast the seeds with a small hand seeder, at about 200% reccommended rate. Then I use the same rake to slightly cover the seeds. No store bought fertilizer and water when it doesn't rain.
What do the chickens prefer---------
So far I have planted for fall/winter, rye grass, mustard green, turnips and rape. Spring and summer, corn, bahia grass, millet, red clover. Everything but the red clover has readily sproutted, I have seen maybe a sprig of clover here or there. The chickens seem to prefer the rape, mustard greens, turnips with the rye grass far and away the most favorite. The bahia grass last eaten.
I have since changed the way I graze them. I have found that 12 hours was to long. The ten chickens could do more damage in 12 hours then could be regenerated. So now I graze them an hour or two at a time. I requires more supervision but the "garden" will last all season.