Several of my (50) birds are coughing. Roosters start by getting a gurgly crow, and then stop crowing altogether. They are fat, active, and hungry. They do not have discharge from eyes or nostrils. Poop looks normal. Egg production has nearly stopped. Seriously. 40 mature hens. 2-4 eggs per week. About 5 of my birds show symptoms. The rest seem fine. I am assuming this is MG, but I have no idea, really. I've read that any upper respiratory infection means my birds are now carriers. I incubate and sell eggs. I think MG is passed to the embryo. Am I right about that? I am seriously wondering if I will have to cull in order to continue breeding and selling. I can't imagine culling any of my birds, but when I think about my sweet silkies and show-girls, I just about die inside. Is there a chance this could be something that's less of a big deal? Are there other options?