I don't know about birds eating feed off of astro turf! but I do know my birds that free range, they eat grass, weeds, and BUGS, ....o k an occasional worm, they gat a little cracked corn, and laying mash, but very little in warm months. those eggs taste wonderful. no comparison to those and the cheap (ish) store eggs. fact.
Got a few dead ones to take down to dads and throw in his outdoor furnace, once the smell of burnt feathers goes away it smells like someone grilling chicken!! Lol