It's in my crumbles I buy around here. The eggs get layed in the feed during the winter and as the weather changes and gets hotter, -being in the feed storage houses it can get pretty humid- the eggs hatch out. I feed it to my chicks, and have since I got my chickens. It doesn't seem to hurt them at all, it's just a special treat. The layer pellets as far as I can tell don't have any. But what the bugs do is basically just chew down the food til it's powdery, but if you have alot of chickens and feed often, you should get to the bottom of the feed before the bugs do too much damage.. But if not, and the bottom is nothing but powder, you can toss it over the ground and let them dig through it.