I feed my birds crumbles as well as scratch, scraps, free range, etc. My question concerns the crumbles. When I feed my chickens the crumbles as soon as they dig in I have one Roo and one hen that always go to sneezing/choking? They're beaks hang open and they make high pitched sneezing sounds. It freaks me out because it makes me wonder if they aren't really choking until they get their bearings again. And my other birds don't have this problem. What is this? Anyone know? And also...I was thinking about switching to pellets from crumbles because of the waste, how difficult is that transition?