OK, I thought I had an isolated issue with two hens. Now it looks like I have two more with the same issue. The breed is Cochin. close to two years old. Issue is affecting my Buffs. Symptoms are slight lethargy for several weeks. Slowly progressing, but have not noticed all that much, as we have over 40 hens. We had had an issue with diarrhea with the first hen, but that was mostly under control after natural treament. Last week, I found the first hen not moving with a purple comb. We culled her, and I suspected that this might happen to one moore hen I was keeping an eye on. The second one died today, and as I was taking her out, I noticed that the other two Buffs combs are purple tipped now. What gives? The flock in general is healthy. I do plan on picking up some extra vitamin supps for them this afternoon.