I was wondering primarily what differences there are between horses that are hermaphroditic and genetically normal horses. Are they typically infertile? I have read of hermaphroditic mares that cycled regularly but wouldn't breed. Does anyone on this board have a hermaphroditic filly/colt? I hadn't heard of anything like this until yesterday, so I'm kind of curious.
Do you mean hermaphrodite (i.e. having reproductive organs of both sexes) or intersex (not a defined sex - XX or XY)?
True hermaphrodites are very rare in the equine. Pseudo-hemraphrodites however are more common, and are actually a chromosomal dysgenesis. In other words, instead of being XX or XY, they can be:
XO - analogous to Turner's syndrome in humans, and the most common form of equine chromosomal dysgenesis. These animals will have incompletely formed reproductive tracts - mares may appear to cycle or not, and often have minuscule varies that fail to develop follicles. Infertility is most common although in rare cases, mares may become pregnant with, or give birth to one or two foals.
XXX - Trisomy. Universally sterile mares. Rare.
X/XX - Mosaics. More common, mares will range from sub-fertile to infertile.
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