1 of mine has 10 weeks to go & she looks rather large too - She twinned, but vet advised me that other 'twin' was no more and the one I have left is big. I have to say I do keep wondering based on her size tho (& she is a TBx).
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Bless! 320 days is safe. keep us posted.
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Even less than 320 days is normal for some mares. The longest my Rosie has gone is 323 days and he was a monster that took 2 hours to pull out! I always say if she'd waited he'd have come out saddled and bridled!
Last year was her shortest pregnancy - 315 days - and that was a BIG filly! Another Rosie daughter foaled her 2nd foal (also a filly) 3 days earlier - but 344 days of pregnancy - and it was HALF the size! But the Rosie daughter was HUGE - some mares look as if they're going to have a BIG foal - and then spit out a tiddler. Some look like they'll go another month - and have a biggie.
The first of mine has 7 weeks until 340 days, and she seems to be majorly fed up most of the time now, and eat? All she wants to do is stuff her face and woe betide any other mare that comes anywhere near her pile of hay!
My maiden foaled at 320 days, foal was small but very healthy, the mare wasn't overly big either. The foal now nearly a 2 year old is as big as the rest.