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Bad news, 2 months early and a big milk bag. Vet coming tomorow to ultrasound, etc. Valuable foal inside this mare! Is there a forum out there somewhere that discusses just breeding and problems associated with it. Never had this before, although I’ve had 2 premies many years ago, both 6 weeks early, and both made it without a lot of addl expense, (couldn’t stand for a day or so, couldn’t nurse either for that amount of time) but they didn’t turn out all that great.
I need all the help I can get. I already got conflicting opinions from 2 different vets on what to treat with…![/QUOTE]
Forgive me if I missed this… you mentioned “two months early…” …Two months from when? 340? How many days is your mare currently?
I ask because I routinely have a mare who gets a large bag around 280/290 days and foals at 320. The foals are always fully developed and do great. The vet believes she is just a “fast cooker.” 
So if you believe she is bagging up 2 months early from 340, that puts her right around 280 days, which is where my mare always is.
Despite knowing this about my mare, I always have the vet out who does an ultrasound and we have done preventative meds for placentitis as well, just to be sure. But I think after this happening now for three consecutive foals… I might reconsider. 