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How reliable are sex checks?

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  • How reliable are sex checks?

    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?

    I am happy with the outcome regardless.

  • #2
    Some vets are better at it than others. The vet I used when I was breeding has about a 90% success record.


    • Original Poster

      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!!


      • #4
        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).
        Already excited about our 2016 foals! Expecting babies by Indoctro, Diamant de Semilly, Zirocco Blue and Calido!


        • #5
          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!
          Signature Sporthorses


          • #6
            we have had several 100% accurate for us


            • #7
              50% accuracy ;-)


              • #8
                Originally posted by risingstarfarm View Post
                50% accuracy ;-)
                My thought exactly!
                I love cats, I love every single cat....
                So anyway I am a cat lover
                And I love to run.


                • #9
                  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!!!--


                  • #10
                    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).
                    Emerald Acres standing the ATA, Trakehner Verband, sBs, RPSI, and ISR/OLD NA Approved Stallion, Tatendrang. Visit us at our Facebook Farm Page as well!


                    • #11
                      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.
                      Altamont Sport Horses
                      Trakehners * Knabstruppers * Appaloosa Sport Horses
                      Home of stallions: Ambrosius af Asgard "Atlantis" & Hollywood Hot Spot
                      Birmingham, AL


                      • Original Poster

                        Thanks. I am glad of the outcome just surprised that's all.


                        • Original Poster

                          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.