How Accurate is Ultra Sound Dating? - The Horse Forum
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post #1 of 5 Old 03-21-2014, 01:45 PM Thread Starter
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How Accurate is Ultra Sound Dating?

My Bo has a mare that was ultra sounded June 21 and told the fetus was 20 days old, making her due date in the first half of may. She was bred on the two previous cycles and apparently didn't catch on either(ultra sound showed her open). Well, she is progressing faster than expected and looks like she could go in the next three weeks. Which would be right on track if she caught on the second breeding, But quite early if the US was correct.

Just wondering if anyone knows how accurate early fetal dating via US is?
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post #2 of 5 Old 03-21-2014, 02:20 PM
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Quote:
Originally Posted by BlueSpark View Post
My Bo has a mare that was ultra sounded June 21 and told the fetus was 20 days old, making her due date in the first half of may. She was bred on the two previous cycles and apparently didn't catch on either(ultra sound showed her open). Well, she is progressing faster than expected and looks like she could go in the next three weeks. Which would be right on track if she caught on the second breeding, But quite early if the US was correct.

Just wondering if anyone knows how accurate early fetal dating via US is?
I JUST made a post about this. I AI'd my mare on 4/19 last year. On 5/3, so 14 days later, they had me bring her in for an US preg check. She checked open, so we rebred her on 5/8 & 5/10 via hand breeding at home. So she was in foal, and we used the 5/10 breeding date to get a "due" date of 4/15 this year. Guess what? She's getting ready to foal, right on time for the 4/19 breeding date have been the one that caught. I had an old vet who told me once that "We flush more viable pregnancies between 14-17 days than we catch.". I have never done a preg check earlier than 17 days and usually not til 20 or 21, until last year. Guess I won't be doing an early preg check again, either.
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post #3 of 5 Old 03-21-2014, 03:27 PM
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We bred my mare 6 times last year. When she finally caught last year on the 6th try, she was confirmed in foal at 14 days with a big healthy embryo sitting smack dab in the center of her uterus. I came back 10 days later and we searched for an HOUR on the ultrasound trying to find the embryo. Three different vets. No baby, anywhere. Our repro vet told me to keep her on regumate until 40 days and come back again for a re-ultraound just to be on the safe side. She told me to watch for signs of her coming back into heat etc.

Came back for the 40 day ultrasound, and bam! Beautiful healthy 40 day old baby right where we saw it at 14 days lol. We all couldn't believe it.

Moral of the story - veterinarians make mistakes just like everyone else. Mare's have this uncanny ability to hide things in their uterus apparently. As far as accuracy on ultrasound, experienced repro veterinarians can generally just look at the embryo on ultrasound and tell you approximately how old it is. The changes are so distinct during that early time period that is is "relatively" easy to at least give a estimate.

Here's a 14 day embryo as compared to a 40 day embryo - just for comparison sake.

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post #4 of 5 Old 03-21-2014, 03:36 PM
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My mare was right on track. She was bred by pasture breeding on April 12th-16th. We were going off of the 16th being the last day she was bred.

When I have her ultrasound at 18 days, my vet said we had a embryo consistent with a day 21. So, she must have caught the very first day.

She foaled a filly at 337 days based on the 21 day embryo. And she was a maiden.

This is my only experience with ultrasound. I can see where there can be mistakes.

I had another ultrasound at 3 or 4 months I think? It was right at the cut off of doing ultrasounds due to the foal dropping lower in the uterus. To try and see gender, but all it said was we still had a baby.
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post #5 of 5 Old 03-21-2014, 08:16 PM
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A good ultrasound tech should be able to accurately date a 20 day fetus. If she's progressing too fast check for signs of placentis
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