We just recently purchased 6 Buff Orpington hens that are getting ready to turn 8 months old and were already laying. Yesterday I noticed one of the girls has a black diarrhea. Not sure if it's a "stress" or if it's food or illness causing it. We currently give them layer crumble and have recently given them stale bread ( OMG They're like my labs with food , when it comes to stale bread lol ) and some cabbage leaves. Just was wondering if anyone has had experience with black diarrhea in your hens and could offer some tips.