Friday, July 1, 2016

What is sex reversal syndrome?

Sex reversal syndrome is a genetic disorder in horses that causes XY embryos to develop female. Most of these mares are infertile and some are obviously intersex. (Some can appear to be normal and produce foals, though, but the syndrome appears to be hereditary).


  1. Produce foals! Okay, that part seems quite odd. I didn't think that was possible!

    1. Yup. I don't know about other species, of course. It's pretty rare, though, and if a breeder finds out a mare has it they're likely not to breed them.