Two cases of triplet pregnancy in two thoroughbred mares, diagnosed 15 and 16 days after mating, are presented. In both cases supernumeraries of embryonic vesicles were manually reduced. In one mare the single, intact embryonic vesicle developed properly and the pregnancy terminated with the delivery of a healthy foal. In the second mare the single embryonic vesicle developed for 2 weeks and then between 2 and 6 weeks after the intervention the pregnancy was lost. Summing up, it should be emphasized that in mares there exists a real possibility to find more than two embryonic vesicles during pregnancy detection. The detection of triplet pregnancies in both thoroughbred mares confirms the predisposition of this breed to have multiple ovulations. As in twin pregnancies, supernumerary embryos may be reduced manually to a single pregnancy, which can continue to develop up to its term.
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