I took the plunge and bought a 50lb bag of chicken layer crumbles to use in my litter boxes. I bought non-medicated starter poultry crumbles. They are Dumor brand from Tractor Supply. I have read several articles online (and a few posts here) about how chicken crumble is very similar to World's Best Cat Litter. I've never used WBC, but the crumble I bought is not clumping very well. The cats seem to have taken to it ok, but I'm worried it will have to be replaced very often if the urine doesn't clump well. I bought the baby crumbles b/c they are smaller than regular poultry/egg crumbles. One person online had suggested that it would clump better if the smaller crumbles were used. It also appears to be a little darker in color than WBC (at least compared to the picture on the bag). It is 20% protein if that matters... Any thoughts from those who use or have used Chicken Crumble?