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# Non-dun1
- URL: https://equinecolors.com/nd1/
- Published: 2025-11-25T10:59:58.000Z
- Updated: 2026-08-10T10:42:28.000Z
- Description: Non-dun1 is located on the same gene as dun. It causes primitive markings. It leads to the colors chestnut nd1, black nd1 and bay nd1.
- Author: Hannelore Roodhooft
- Tags: Colors, #Import 2026-08-12 09:42

> Non-dun1 or nd1 causes primitive markings, but lacks the dilution of the coat that dun produces.

## Colors

[Chestnut non-dun1Chestnut non-dun1 (or nd1) is a horse color caused by nd1 on a chestnut base. Primitive markings are present.![](https://equinecolors.com/content/images/icon/favicon-121.ico)Equine ColorsHannelore Roodhooft![](https://equinecolors.com/content/images/thumbnail/chestnutnd1.png)](https://equinecolors.com/chestnut-nd1/)

[Black non-dun1Black non-dun1 (or nd1) is a horse color caused by nd1 on a black base. Primitive markings are present.![](https://equinecolors.com/content/images/icon/favicon-122.ico)Equine ColorsHannelore Roodhooft![](https://equinecolors.com/content/images/thumbnail/blacknd1-1.png)](https://equinecolors.com/black-nd1/)

[Bay non-dun1Chestnut non-dun1 (or nd1) is a horse color caused by nd1 on a chestnut base. Primitive markings are present.![](https://equinecolors.com/content/images/icon/favicon-123.ico)Equine ColorsHannelore Roodhooft![](https://equinecolors.com/content/images/thumbnail/baynd1.png)](https://equinecolors.com/bay-non-dun1/)

## Gene

[TBX3 geneThe TBX3 gene is responsible for the dilution dun and non-dun1.![](https://equinecolors.com/content/images/icon/favicon-119.ico)Equine ColorsHannelore Roodhooft![](https://equinecolors.com/content/images/thumbnail/tbx3-1.png)](https://equinecolors.com/tbx3-gene/)

## Presence in horses

Non-dun1 is widespread and can be found in most horse breeds.

[Back to Dilutions](https://equinecolors.com/dilutions/)

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