ask that question here: https://www.backyardchickens.com/t/...l-up-a-rockin-chair-and-lay-some-wisdom-on-us Someone there will have the answerWe do not have arial predators like you guys would in the US. Eagles would be our only worry, and we have a lot of cover. Woods and a ton of trees throughout the yard.
Anyway. Yeah, I've seen build up on at least 3 or 4 of the 21 chicks my two moms are sharing. What could I be doing wrong? They are on chick starter, no heat lamps and tons of fresh water changed every 12 hours. Still I see build up. No blocking of vent, but there is poop on the butt fluff.
These aren't chicks she hatched or I incubated and hatched. They are RSL feed store chicks. Before this I've only had one issue of a broody raised chick with pasty butt.
Oh and they have ACV in their water as well. Or at least they do when I am doing the watering.