I am looking at a mare that the vet has said releases 2 follicles at the same time from the same ovary. He said he has never seen this behavior before and could be an issue for breeding. This mare is 9 years old, never had a foal and when in heat is a handful. Have you heard of this and has it posed a problem?
sure. my mare did the same thing last breeding season. As I understand it, double ovulations are more common in some breeds (like drafts and thoroughbreds, my mares a TB), is more common on open mares than those with a foal at their side, and more common early in the breeding season.
As far as being a problem, well it means you got two chances at getting a fertilized egg, i see that as a benefit. But you also might get twins, hence the need for ultrasounding to check before 28 days (I u/s at 14 days, then again before 28 as necessary anyway). I do that anyway, so Im not real concerned with a double ovulation. What exactly was your vet concerned about?
Hopefully Jos can swing by and correct any mistakes I made.
If your veterinarian has never seen two follicles ovulating, he has not seen many mares. It is perfectly common with as many as 30% of mares double-ovulating. It is not an issue for breeding. It actually increases the chances of conception, but does - as noted by Charlotte - present the possibility of twinning, and additional evaluation should be performed accordingly. We always recommend ultrasounds at 15 and no later than 28 days anyway (regardless of there being a double ovulation or not) in order to detect twins.
I really don't understand why your veterinarian would have presented this as a problem. If they genuinely did, and also said - as you suggested - that they had never seen or heard of this before, you may want to consult with a different vet for your breeding work.
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