We believe the Marchador mares are very robust and natural in their heat cycles. Like some other ancient breeds, the Marchador mares hold on to their egg folicles much longer and their follicles get much larger. Many breeding vets start their breeding process with a follicle of 35 mm. With a Marchador mare, we often wait until at least 45 mm or 50 before we begin breeding. We have seen follicles of 52-60 mm without ovulation in our mares.
So, our advice is - when breeding with AI - wait a day or maybe two - more that what the textbook calls for.
Of course, every mare is unique and ultrasounding each of your breeding mares during their estrus cycle will provide valuable information to you on how to manage that mare.
Good luck!
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