Eh... I would say ventilation.So the chickens poop all over the roosts and given that wood is porous, I fear that is contributing to the problem we're having with respiratory diseases.
My chickens poop on their perches, and I do not clean my coops as often as I should.....
But, no respiratory issues. None.
See? Poopy perch.
I'll continue to watch to see if there's some sort of pattern for its usage.