Genetic test have confirmed that Martha Maxine was born as a mare hermaphrodite, with male sex chromosomes.
He was born female.
In June, the horse was reclassified as a male by the U.S. Trotting Association and barred from female-only races.
As a female, Martha won 13 races last year and collected over $190,000 in earnings.
According to the horse trainer, "If not for those tests, you never would have known this with this mare...We paid a lot of attention to her because she's a good horse and we didn't have a clue."
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