How often should the mare be palpated?
Our vets do an initial ultrasound to confirm pregnancy at 16 days post insemination, then a second check at (or post) 40 days. I don’t see why one would need to have any further ultrasounds beyond this point unless there is a particular reason to be concerned.
My vet also did one at 100 days.
Typically, I’ve had a vet check post PG confirmation at 45 days and then at around 100 days. If a mare is going to slip it usually before 100 days.
Thanks all 
Standard procedure on TB farm:
Check for ovulation the day after breeding.
Check for pregnancy somewhere between day 14-16.
Check for twins somewhere between day 18-21.
Check for heartbeat after day 25.
*Optional: If mare shipping out of state, check again between day 35-45 to confirm before sending her home.
In late fall we usually had the mares palpated to confirm pregnancy; if any had slipped, we’d start them under lights after Thanksgiving. Problem mares may be ultrasounded as well to check the thickness of the placenta.
Post ovulation us
15 day check for pregnancy and twins
25 to 30 day check for heartbeat and recheck for twins
No others unless something looks wrong. Out vet prefers a 45 day check also but I decline…if the pregnancy is lost after 30 days she’s not coming back in/ wont be breed able that season anyway and the farm call alone is 80 dollars.
We did one at 100 days as well, but it was more of a, “the vet’s here, let’s look at the baby,” type of thing. The vet keeps coming out to do the pregnancy vaccines, and whenever she’s out to see someone else we pull my pregnant mare out to admire her growing belly
Definitely get the first scan at around 16 days as thats the easiest and safest time to sort out twins without losing both pregnancies. Around day 25-30 to check for heartbeat. Some do day 42 as well. These last two cover the highest risk period for losing the pregnancy, and allow the mare to be re-bred that season. No other checks should be needed and can sometimes cause more harm than good. However if the mare has a history of placentitis, difficulty foaling, etc or something seems wrong then a scan is urgently needed. Conditions like placentitis are fairly easy to manage if diagnosed, but without treatment the foal will almost certainly be aborted or born with severe issues.
Unfortunately breeding is a lot more involved than a lot of people realise!
… and sometimes the stallion owner will tell you when they want your mare checked… In my experience that has been day 14 to 16, 30 days and then 60 days.
