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If this is your only option, then the issue of quarantine is moot 'cuz touching noses ain't quarantine. Realistically, not quarantining is fairly unlikely to cause major
permanent problems in your horses (it *can* - it is not unheard of to get permanent effects from pneumonia or strangles, for instance - but it is pretty rare). But you can incur some
big-time vet bills and hassles along the way. Quarantine is not nearly as big a deal in horses as in chickens, though, or even cats or undervaccinated dogs. It would be helpful if your geldings have gotten a flu/rhino vaccine about 2-3 weeks ago (DO NOT have them done now, though) but chances are you will all survive
BTW, if there should happen to be a way to prevent the horses from touching noses over the fence for a day or week, that would be smart -- often the first thing that horses want to do when a new one arrives in an adjacent paddock is touch noses, squeal and then kick or strike, which can cause injuries (from the fence as much as from the other horses). It also does not get things off on the calmest foot.
If one of the pastures is small (like actually more of a small paddock) I'd make sure to put the new horse in *that* one. OTOH if one of them has less-visible fencing, or electric fencing of a type that you are not POSITIVE the new horse is well-accustomed to, then use that for the geldings and put the new horse in the other one.
Have a big ole pile of hay out for the geldings before the new horse arrives -- put it out an hour ahead of time if the mare is being delivered, or before you leave to go pick her up. Full tummies make calmer neighbors
To a very large degree, though, if you don't have a fully doublefenced paddock where she *can't* touch noses with anyone, you're just going to have to make sure your fences (and gates!) are as visible and safe as possible, and then turn her loose and grit your teeth
I find that averting my eyes from horses doing moronic things in turnout is always a good move <g> although of course you do want to peek out at frequent intervals to make sure nobody needs a vet. usually it turns out just fine though.
P.s. make sure the mare is not in heat. DO NOT put a mare out with new horses, esp. not geldings, for the first time while she is in heat.
Good luck and congrats on the new horse,
Pat