This past week, a first arrival came in the form of a filly. During early stages of the pregnancy a sex check had been performed and I was told that within a 90% predictability factor. "Both mares would produce colts." The first to arrive is a filly.
I could not be more pleased, but it raises doubts of sex check accuracy?
Was I in the 10%_ile of cases?
In all reports the vet used was very good. Head vet at University of Columbia, Missouri. I am very fortunate to have encountered a very reliable top notch facility to help raise the foals economically. I feel fortunate to have been connected with these good midwest folk.
Like I said, I couldn't be more pleased with the error however it occured!!
Some fetal sexing experts are 90+% with their accuracy. However, it takes A LOT of practice and is still tricky. The fetus has to be in the correct position and there is a narrow window of time (I think 55-70 days, but don't quote me on that). I know that we do it around 60-65 days.
The vets at MU are excellent, but I know for a fact that in that area they aren't getting to practice their fetal sexing much. They don't get to do a huge amount of repro b/c Equine Medical Services/Dr. Foss is just down the road from them (about 10 minutes away).
We have only tried once, just because vet was here when one mare happened to be about 60 days along, and the vet said it looked like a colt... she was right! Not enough experience here to really say one way or the other, but it was neat that she was right!
My vet and I have a deal. I do the string test and she does the ultra sound. We have agreed 100%. But she does the mares at about 90 days for free. If she is right I pay for Mexican Food and Margaritas. Last year the bar bill was much more than the ultrasound would have been!!! This year she is "in foal" so when we go I will get away with a much cheaper dinner!!!--
I am two for two being correct. I had my vet fetal sex 2 of my foals this year - one by happenchance (following kissing twins) and one actually planned for an ultrasound to fetal sex on day 60. Dove was said to have a filly (yep, Ruby is on the ground), and Cory was said to have a colt (and yep, Nick is on the ground).
My understanding is that the fetal sexing is supposed to be done from day 60-65. I don't usually bother but the one year we did it, the vet was correct 50% of the time (only two mares in foal that year)...not a very large sample size.
Continued news is that the second of my two mares has foaled a filly so regarding predicatability. I guess we are batting a 100% in error and oddly enough, I couldn't be more pleased with the result from my standpoint. I have two young filles by Corcovado. Life is good.