Thanks for the reminder! I'll be doing that this week, I think. It's only about 15° right now and not supposed to snow for a few days, so I'll get a little time out of it.
I'm actually glad they are limiting antibiotics. I see so many people who will just throw antibiotics at their birds, without knowing what they have going on. And the biggest issue is medicated feed. Low dose antibiotics are not good at all. Those are linked directly to creating antibiotic resistant bacteria, which is similar to the issues with people overusing chemical wormers.