We feed our chickens mainly rice (white, brown & wild ) when we feed them white we add a little crumble to it, along with DE, they eat many different types of grains but not corn unless it is fresh from the garden or an ingredient of the crumble, they also like the corn salks , bean leaves, cucumbers, steamed zuchinni, figs, berries plus they free range on grass, bugs etc. When they eat the rice it seems to end up on the ground so they are also getting their grit. In the winter they love the rice cooked from our rice cooker and taken to them warm with the steam coming off it ,they just gobble it down.