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Hi Laura, sorry for the delayed response but just saw this as I was going back thru some old posts. I didn't know that MG could have different strains but it doesn't surprise me as I learned a BIG lesson a couple of years ago about Cocci and bringing in a different strain to your flock. If memory serves me right, there are like 14 or 16 different strains of cocci. Build a resistance up to your flock on one strain, then bring in another strain from importing chicks/birds from someone else, and BAM - now you got both sets of birds down with cocci. I imagine MG is no different now that you mention it.
As for the coops being too air-tight. No, I have two windows, a dutch door where the top half stays open all the time and the bottom half during the day plus a small fan inside to help circulate the air. Having said that, as for being "too moist", this is WA and there's just no way I can keep the coop dry for long. I'd have to be replacing the shavings about every other day come this time of the year and that would cost a fortunate plus not to mention not having the time to do so.
The two chickhouses may not get enough ventilation and I'm working on that. The birds are old enough now where I can leave the top and bottom doors open but even with that I'm thinking I may try to find some small little fan to put inside to improve the circulation.
However, having said that, I'm not experiencing the problem with all the birds. Rather just a select few so I tend to think it is more of a strength of immunity type thing. Time will tell.
God Bless,