Well I cleaned up the pasty butts, outa 16 chicks 5 had it, 1 was a little dirty but wasnt really a issue, cleaned him anyway. Its odd. the ones that have it are all the same "type" except 1 little bantam that had it too. Have 13 "assorted pullets" 4 yellow 4 redish tanish and 5 black with white/gray specs. and all the black ones had it. But anyway, back to what im trying to ask... How do i get them to eat the yogart so they dont get it anymore?!?! Ps This is the 2nd day ive had them from TSC so not positive how old they are. they seem to get around awfully well for 2 days old, but Ive never been around chicks so I dunno maybe they are 2 days old.