Gene Test, Research Unravel Severe Skeletal Atavism Limb Deformity in Shetland Ponies

Limbs of a 16-week old Shetland pony with Skeletal Atavism, often described as "bow legs". (Left) caudal view when standing; (center) caudal view when walking and (right) view from the front when standing square.  Complete, or "fused", fibulas and ulnas cause instability in the tarsocrural and antebrachiocarpal joints respectively; the angular limb deformity becomes more severe at the walk. Photo: Ove Wattle

Skeletal Atavism is a genetic defect that can cause skeletal deformities in Shetland ponies. The deformity has now been genetically identified by researchers at Uppsala University and the Swedish University of Agricultural Sciences (SLU), in cooperation with colleagues in the USA at Texas A&M University, the University of Kentucky's Gluck Center, and the University of Washington, as well as at the University of Qatar in the Middle East. The discovery means that healthy carriers now can be identified for better breeding decisions with the use of a gene test.

Polydactyl Jackpot: Seven-hooved Foal Born in Belgium

In Nordic mythology, the famous Sleipner was the eight-legged horse ridden by arch-hero Odin. Alexander the Great's Bucephalus was allegedly a polydactyl as well, and Julius Caesar is said to have preferred to ride a horse with extra hooves.

Hold on to your hoof picks, the owner of this foal might need to borrow them.

A mare at a petting zoo in Belgium has given birth to a foal with seven hooves. Three of the foal's limbs are equipped with what are called supernumerary digits.

A year ago, the Hoof Blog splurged on a collection of bits and pieces from around the web about these unusual quintaped horses. We even found a Shire draft horse named "Norfolk Spider" with six hooves.

That particular post has gone on to become one of the "top 10" posts on the Hoof Blog of the last four years. Everyone seems to be curious about multi-digit horses. (See link to that article and photos below.)

It is unclear what will become of the foal in Belgium, partly because the information available is not in English and I'm hesitant to translate it with any certainty. It does sound like the vet school at the University of Ghent in Belgium is interested in obtaining the limbs, but it doesn't say that they are interested in the foal that is attached to them.

Click here to see two of the seven hooves of the foal in Belgium. That photo is protected by copyright. Hopefully more photos will be available, and I will be able to post them here.

Will the foal live or die? This is the kind of thing that people used to pay money to see on the midway at the fairs in Vermont.

It brings to mind one of my favorite poems by one of my favorite poets:

The Two-Headed Calf

Tomorrow when the farm boys find this
freak of nature, they will wrap his body
in newspaper and carry him to the museum.

But tonight he is alive and in the north
field with his mother. It is a perfect
summer evening: the moon rising over
the orchard, the wind in the grass.
And as he stares into the sky, there
are twice as many stars as usual.

"The Two-Headed Calf" by Laura Gilpin was featured on the Hoof Blog back in August 2009 after I heard Garrison Keillor read it on NPR's Writer's Almanac.

Good luck to the seven-hooved foal in Belgium. May he gallop his field with confidence some starry night soon.

TO LEARN MORE:

Click here to read  Polydactyl Horses (and People): Why Are Some Horses Born with an Extra Hoof?


Thanks:  Painting of Sleipnir by Ahula Tinga. Carving of Odin riding Sleipner is at the Oslo City Hall in Norway; photo by Jaime Silva.

© Fran Jurga and Hoofcare Publishing; Fran Jurga's Hoof Blog is a between-issues news service for subscribers to Hoofcare and Lameness Journal. Please, no use without permission. You only need to ask. This blog may be read online at the blog page, checked via RSS feed, or received via a digest-type email (requires signup in box at top right of blog page). To subscribe to Hoofcare and Lameness (the journal), please visit the main site, www.hoofcare.com, where many educational products and media related to equine lameness and hoof science can be found. Questions or problems with this blog? Send email to info@hoofcare.com.  

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Polydactyl Horses (and People): Why Are Some Horses Born with an Extra Hoof?

This polydactyl was found in British Columbia by one of the farrier students at Kwantlen College. Gerard Laverty, the instructor at Kwantlen, sent these images to me, which started my collection. Image © Hoofcare Publishing and Gerard Laverty.

If you visit farms and horse barns in New England, you'll sooner or later find one with a clan of double-pawed cats. Their owners are usually quite proud of them and love to show off their big mitts. The condition is so common around here that most people don't give it a second thought. A lot of people actually prefer them, especially if they are Maine Coon Cats.

But when the equivalent of a "double paw" shows up on a giant Shire draft horse, people notice.