We've got (or had) 5 hens housed with 3 ducks. A couple of our hens have had chronic dirty vents and some diarrhea. They're housed in a huge outdoor pen (with coop inside) so it's not easy to tell who is laying or what poo looks like in great detail, but it's clear that 2 of them had diarrhea based on their matted feathers. None seem lethargic or otherwise sick that I can tell but those two were a bit skinny and not all were laying. We try very hard to provide fresh water daily via a drip irrigation system and gravity water feeder however the ducks are a real challenge to keeping water clean! Despite adjusting water situation, we found one of our hens dead in late April. Then we treated with Safeguard for worms just in case. Diarrhea in the second hen didn't completely resolve but didn't seem to progress...however we just found her dead this morning. The remaining 3 hens don't appear to have dirty vents but I'm very concerned they might have the same illness. Thoughts on whether this could be coccidiosis or bacterial or viral? I don't know of any poultry vets nearby, but could maybe send in a fecal sample. In the meantime I have Tylan50 on hand and am wondering if I should treat. EDIT: All of the feces in their coop beneath the roosting branch appears totally normal. They're fed a 21% start to finish feed.