I have a flock of Buckeyes with about 50 birds. Over the past few months, I've lost 3 roos but no hens. They get very weak and thin, then pass away in just a few days. They aren't that old, one of them only being 2 years old. I've observed them enough to eliminate the possibility that the "top" roo is running them away from the feeder. I've never even seen any of them fight. I had 6 roos, so I'm down to 3. Luckily I hatched out some, so I'll have replacements, but it's really worrying me, and I'd like to get the problem fixed. Any ideas?