Thank you for explaining the differences.Pasty butt is what baby chicks get when they get “backed up.” Can be due to too much heat or improper diet, even stress. Laying hens can get a dirty butt or vent gleet which yes can be indicative of health issues but I don’t believe salmonella is one of them. Worms yes, but it can also just be extra fluffy down feathers that catch poop. I have several chickens that need their bottoms trimmed regularly. But pasty butt is not the correct terminology for anything other than baby chicks.