Switching from crumbles to pellets will take some getting used to for your birds but they will adapt.I was in the same situation as you fed dumor for a long time and then switched to Nutrena all flock and am not going back to Dumor.. The dumor is a 30 mile drive for me and the nutrena is a 50 mile drive so one day a couple of months ago when I ran out I bought a bag of dumor till I had time to drive the fifty miles. The dumor in my area has changed, when I opened the bag it smelled like something had already eaten the feed. I made the drive the next day and tossed the dumor. for me at least in this area the all flock is cheaper and my girls do better on it than the dumor I just have a little oyster shell on the side and all is good.l