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I wonder what nd1 would look like if it existed

Nd1 looks like a non-dun horse, but with some dun-markings, like a dorsal stripe, zebra stripes on the legs or a darkened area over the withers. Some nd1 horses have less, some more of the dun-markings. They do not have the dilutions, caused by dun.

To simplify it, there are one way for a horse to be dun (D), but there are two mutations for non-dun. Nd1 leaves some of the dun-markings, and nd2 leaves no traces of dun at all. The nd1-mutation is probably older than the nd2-mutation, and is very common in older breeds, like the iberian horses. I have seen only a few lusitanos without nd1 f.ex

My horse is nd1nd1, and was actually one of the horses that we collected samples from when the scientists found the Dun-gene

(sorry about my english, my brains are very language confused today)

@Feather Farms exactly :)

I just noticed the change and I was so confused! Thanks for the explanation!

Ah, I found a photo of him, showing the signs:



And here are a few of his nd1-foals:

The little filly, that did not get her will for the first time:




Brasil is their father, different mothers.

Great photos!

I minor correction though, it's a lightening of the body not a darkening of the top line. nd1 horses have some very mild body dilution.