I have two Barred Rocks about 6.5 months old. The last few weeks they have both started to have a poopy build-up on some of the feathers around their vents. I've inspected the area and don't see anything suspicious. I have also been monitoring their poop, and it all looks normal (I never imagined I would spend this much time looking at poop). I tried to clean one of the girls up, but a few days later she had some build up again. I have an Australorp who has never had this issue, so I don't know what to think about my messy BR girls. I am wondering if the dirty feathers are something to be concerned with. They both just started laying, and I am kind of worried about getting dirty eggs. Is there anything I can do to help them clean up a bit? Is the dirty bum a symptom of something else? Could it perhaps be a result of them not dust bathing as much now that it is getting colder?