Actually, someone who bought birds from me awhile back had them tested when she became NPIP certified. She said there were no viruses, no myco-somethings, no cocci, no anything at all wrong with them. The youngsters she got from me came from my Barred Rocks, my BBS Orps and one was my Meg's daughter. That made me feel really great, I can tell you. Obviously, it was not my older birds tested, but since many awful diseases can be passed through the egg, I was very happy that the birds who are leaving my place seem to be completely disease-free, as I have always thought they were.
I do not believe it's feed. I feed mine excellent quality feeds from the co-op. They are fresh-smelling and not dusty at all. I'm quite pleased with them, really. The birds look great, good feather quality, bright eyes, etc. If it was the feed, then I'd have issues across the board.
