From what I have read, MG is almost unavoidable for those of us with backyard flocks. If a wild bird enters your yard, there is a possibility your chickens will get MG. I can't comment about Ideal or any other hatchery or breeder, but if you are buying chickens to keep in your backyard, I don't see a reason to be too concerned about MG. It won't wipe out your flock.
Correct me if I'm wrong.
Correct me if I'm wrong.