Hey BYC, I just wanted to share some success I had with the pasty butt issue. Well I have 12 Delaware chicks in the brooder and most of them had pasty butt. I decided not to clean em off or do anything about it this time since it never really helped previously for me. For 2 1/2 weeks they had pasty butts but were developing feathering well good vigor all around and i was hopeful that they would solve their pasty problem naturally, then it dawned on me they didn't have a dust bath, so I took a round pan about 10in diameter and filled it halfway with some dirt and the other half food grade DE. I plan to add wood ash just gotta burn some wood. Long story short they all used the dust pan bath and all of the pasty butts were gone. All chick butts have been paste free since, almost a full week. Maybe if we added dust baths to the standard brooder setup. We would all have healthy chicks w no pasty butts! I hope this is helpful!