I use organic layer feed crumbles, and my chickens appear to pick through it for the big chunks (like sunflower seeds), and leave behind this dust that builds up. I'd guess almost a quarter of the feed is this dust, and it is annoying because it builds up so fast that it blocks their feeder. I have a feeder that holds enough for a few days, but I have to only partially fill it every day because of the dust. I have 25 chickens and they are pastured, though our ground is frozen and snow covered right now, and I throw them vegi/fruit scraps, as well as scratch grains and mealworms sometimes in their coop (I'm doing the deep bedding method of composting so that gets them to turn their bedding often). They are healthy and seem to be healthy weights, but it is such a waste to not have them eat all their crumbles, and they appear absolutely starving when I show up in the morning even though the feeder still has plenty of "food" in the form of dust. It's costing me quite a bit of money I think. Is this just a bad brand (we get it in bulk from Cenex), or is this normal? Thanks!