I quit giving my chickens treats to make them eat their food. Strange how absolutely tasty their food is to them now that they don't get that afternoon treat any more. They free range and eat a ton of bugs too, but no matter how healthy the treat, it shouldn't replace their food. It took a few days before they'd eat it but they do now. They are back to getting treats but not every day. I surprise them at different times of day and some days they get no treats at all. They know they can't count on a treat so they eat their food. I'd suggest doing the same. Mind you, their treats are special foods that I really want them to have such as Kefir and scrambled eggs and sometimes a bit of cat food, but none of that should replace their crumbles.