Hi RedRooster,
I'm kind of in flux right now, trying to decide what to do. After doing more research, and talking to Dr Beyer yesterday at K-State, I'm more conflicted than ever.
However, this is the information I got from him:
MG is widespread in Kansas and Missouri (he used the word endemic) and pollorum is apparently a real problem in Mo (my birds don't have that, however)
You can use the Tylan dip on your incubating eggs, but it is not 100%
Ducks can get MG. He said that if I ever want to maintain an MG-free flock, to never have waterfowl again.
Bleach is good for killing MG on the surfaces, but it can last for months in the environment. If I were to cull my flock and clean, he suggested leaving the premises empty for at least 2 months, and getting rid of all possible vectors (mice are apparently a real problem in spreading this)
I asked about getting chicks from a hatchery, and he said that most are NOT MG free, as most don't maintain their own birds, but rather contract with private breeders. You would have to specifically ask to be sure you were getting certified MG free chicks.
He did say that the commercial egg producers have pretty much eradicated it from their stock and facilities, as one of the effects of MG is a small drop in egg production. The small flock owner might not even notice, but big commercial places don't want any kind of drop in production.
To be sure you have an MG free flock, you have to blood test each bird, but I'm not sure how often.
Overall,he made it sound very difficult to eradicate long term, at least in my area. I live in a very rural area with a big wetlands about 5 miles from my house, which is also a source of contamination. I do actually have a farmer who is interested in my flock for his families personal egg use, as their flock has gotten old and mostly died off. So I do have an 'out' other than killing my whole flock. I'm just not sure now, how successful I'd be at getting rid of MG on my place, at least long term. And the thought of never having ducks again? Not sure I want to do that.
I did give 5 of my birds to a friend for processing, as it was getting expensive to feed so many. It was really hard to do, but necessary, and takes some of the strain off of me for now.
I haven't given up completely on the idea of an MG free flock, but for now, I'm going to wait and see.