Mizshelli said:can you explain 'bad butt'??? This is my first batch of chickens and I've never heard of that...
Near as I can tell, it's like a yeast infection of the vent. I'd read you can soak their rear in a vinegar/water mix and did so a couple times. I'm not much of 'hands-on' with my chickens, though, so catching her is problematic. We just call that one hen Bad Butt Karen. She's one of two that has an actual name - the other one is Sissy, my weeding hen who follows me around in the garden. The rest are either one of the Blonde Squad (Buff Orphingtons) or the Redheads (Welsummers).