lets do an informal study- post how many days your mare has gone for a healthy foal
my last mare when 343 days both times. both my mares this year are maiden so I have no baseline for them.
http://www.equine-reproduction.com/index.shtml half way down and 4 thousand participants.
Mares do NOT have a
“due date”!
What was the duration in days of your mare’s live-foal producing pregnancy?
Survey commenced in 2008 foaling season
Results © Equine-Reproduction.com
result 319 Days or fewer: 4.51%
result 320-326 Days: 7.05%
result 327-332 Days: 7.55%
result 333-338 Days: 9.59%
result 339-344 Days: 14.77%
result 345-350 Days: 12.73%
result 351-356 Days: 8.83%
result 357-362 Days: 5.86%
result 363-370 Days: 8.43%
result 371 Days or greater: 20.68%
Total Foalings Reported To Date: 4212
We’ve had a mare deliver at 331 days (healthy filly) and another at 364 days (healthy colt).
320 to 392 days - all healthy babies.
318 to 352…all healthy foals.
357
Our shortest healthy pregnancy: 325 days
Out longest: 353 days
This year’s mares foaled at 329, 339, 350 and 351
324 days for maiden mare
I’ve had them go anywhere from 330 to 355 (the longest thank goodness!)
332 to 434 
Shortest: 315
Longest: 356
All healthy
My one and only attempt at breeding: 342 days. Textbook. 
My one mare went over 380 days. I don’t remember the exact amount, I just know that after 380 days the Jockey Club required a notarized letter stating the breeding dates.
My maiden mare went this last friday at 347 days! The one I had before that went at 346 days!
The earliest was 314 days The latest was 364 days. All of them were healthy.
we have one mare who routinely goes at 313-316 days (always has a full developed very healthy foal) my longest is 353 days.
On average with TB mares we have foaled, as many as 30+ a year, around 345
[QUOTE=MuskokaLakesConnemaras;8637018]
332 to 434 :P[/QUOTE]
- OMG. My mare better not go 434 being at the vet clinic to foal.
Joking aside, I have also read that the early foals (like TB in Jan/Feb) tend to go longer (on average) than 342 and foals in July/Aug tend to go shorter (on average) than 342.
Day 339 today and counting… I’m getting impatient!
342 and counting - but lots of wax - so hoping tonight - took out my knee yesterday and night checks are killing me.
