Hermaphroditism in Horses

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When is a mare not a mare?

South African racing authorities have just reclassified a filly called Tuesday’s Child as a colt after post-race checks showed a raised testosterone count. Nothing to do with dodgy injections or rum dealings: Tuesday’s Child is a male pseudo-hermaphrodite, and he had his breeder, owner and trainer fooled. I’ve actually “met” a horse like this – “Ladyboy*” is pictured above in a group of Konik horses kept by the Norfolk Wildlife Trust for conservation grazing. Like Tuesday’s Child’s owners, the NWT had no idea that the young horse was a hermaphrodite. “She” peed backwards from under her tail and had a small udder, like any filly. However, when she reached the age of two, she began fighting for dominance with the harem’s stallion, and trying to steal mares. She was eventually removed from the group and a veterinary examination revealed that the udder was in fact a scrotum, and that there was a rudimentary penis tucked under his tail. The newly christened Ladyboy was all male, although he was never going to father foals. He was gelded and given his own herd of youngsters to supervise, those solving his own frustrations and that of the main band’s stallion.

26/10/2014 Here’s a news item on a new study on pseudohermaphrodites.

* yes, awful name.

PS. At the time I was researching If Wishes Were Horses, and looking for early instructions for sidesaddle riding. Browsing an eighteenth-century French manual called Le Nouveau Parfait Maréchal, I found a short chapter on hermaphroditic horses who “urinent fur leur queue” (“urinate through their tail”).