Difference between sooty and dun
 

Okay, so it seems that most folks believe that the existance of a dorsal stripe is the only thing you need to say for certain that a horse is dun. Unfortunately, it's not that easy. There are many other things that dun does to the color of the horse that doesn't happen with a horse that has a dorsal stripe due to countershading/sooty.

Dun not only gives a horse a dorsal stripe, but it commonly lightens the base color and may also give the horse zebra striping on it's legs, shoulder barring, and sometimes lacing on the forehead.

I guess the real reason I got to really thinking about this is the herd of feral horses we just rounded up in the last couple of weeks. There were many of them that had dorsal stripes, but I know for certain that there isn't, nor has there ever been, any dun genes in their breeding pool.

Unfortunately, I only have decent pictures of 2 of them with prominent dorsal stripes, but I think it will be enough.

Oh, and please, no comment on their condition, they aren't my horses.

Here is an example of a chestnut horse with a dorsal stripe due to sooty/countershading.
http://i551.photobucket.com/albums/i...g?t=1360892850

http://i551.photobucket.com/albums/i...g?t=1360892832

Here is a random internet picture of a couple of red dun horses
http://www.theequinest.com/images/red-dun.jpg


http://www.dungenes.org/images/Tinker.jpg

Here is the second of the feral horses. She has a bay base and the sooty is clearly evident on her neck and shoulder area.
http://i551.photobucket.com/albums/i...s/DSCN2044.jpg

And here are a couple pictures of her dorsal stripe
http://i551.photobucket.com/albums/i...s/DSCN2068.jpg

http://i551.photobucket.com/albums/i...s/DSCN2069.jpg

As opposed to these bay dun horses
http://ox.equinenow.com/equine/data/photos/278266_2.jpg

http://www.whitehorseproductions.com...ns/dun_bay.jpg




Anyway, just showing that a dorsal stripe doesn't automatically mean that the horse is carrying the dun gene.

This guy is a pure arabian, so no dun possible. He has a prominent dorsal, as well as leg barring. He DOESN'T have any dilution of the coat colour though. As Smrobs points out, a dun horse is one that has a dun gene, not one that has a dorsal stripe.

http://www.whitehorseproductions.com...ck_bayarab.jpg

http://www.whitehorseproductions.com...perLegBars.jpg

I know a mare that is bay but has a dorsal stripe. She has obvious signs of counter shading and her color can vary a bit from season to season.

summer 2009
Attachment 130180

winter 2010
Attachment 130181

her dorsal stripe summer 2011
Attachment 130182

winter 2013
Attachment 130183

Evans - the seasonal change, the dorsal, and the "mealiness" all tell me that this mare you know, she is brown :-) And beautiful!

don't know to much about color genetics so it may be that she is brown :D. I always loved her color, especially in the summer when she has a golden shine to her coat so I guess if she is brown I really like brown horses then :).

Brown horses are fantastic because you rarely get the same horse two seasons in a row. It's always fun to see how they shed out into their next coat.

Thank you for this post, smrobs. I know a few people who think/thought "dorsal stripe" automatically equals dun...even when their horse is an Arab (which as has been pointed out, don't carry dun).
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damnedEvans, I'm m e l t i n g at that driving picture. EVERYBODY at my house knows I wanna make "Buster" into a driving horse.
...needs more work...
I need more money to pay my Amish farrier to train him to drive. **Corporal...weeps**

I also love driving horses so I really understand you. Nothing compares with the view of a nice pair of horses pulling a nice little carriage. I really love to see the movement of the horse with all those muscles working. You can't do this while riding :D.

Dun
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