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# Bay non-dun1
- URL: https://equinecolors.com/bay-non-dun1/
- Published: 2025-11-27T11:40:49.000Z
- Updated: 2026-08-10T10:43:27.000Z
- Description: Chestnut non-dun1 (or nd1) is a horse color caused by nd1 on a chestnut base. Primitive markings are present.
- Author: Hannelore Roodhooft
- Tags: Colors, Dilutions, #Import 2026-08-12 09:42

## Appearance

| Foals | ![Bay non-dun1 foal](https://equinecolors.com/content/images/2025/11/baynd1foal.png) | Regular [bay](https://equinecolors.com/bay/) color with [**primitive**](https://equinecolors.com/dictionary/#:~:text=a%20bay%20horse.-,Primitive%20markings,-Primitive%20markings%20may)markings. Leg primitives may beharder to see. |
| ----- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

| Non-dun1 on a **bay base** causes**primitive markings**. The dorsalstripe is usually the most notable. | ![Bay non-dun1](https://equinecolors.com/content/images/2025/11/baynd1-1.png) | Adults |
| ------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- | ------ |

### Bay shade variations

| Seal brownnd1 | ![Seal brown nd1](https://equinecolors.com/content/images/2026/01/sealnd1.png) |
| ------------- | ------------------------------------------------------------------------------ |

| Wildbay nd1 | ![Wild bay nd1](https://equinecolors.com/content/images/2026/01/wildnd1.png) |
| ----------- | ---------------------------------------------------------------------------- |

### Bay variations

| Sootybay nd1 | ![Sooty bay nd1](https://equinecolors.com/content/images/2026/01/sootybaynd1.png) |
| ------------ | --------------------------------------------------------------------------------- |

### Mimics

![CTA Image](https://equinecolors.com/content/images/2025/12/Equinecolors_Icon_MagnifyingGlass-8.png) 

The ****dun dorsal stripe** goes through the ****tail**, while nd1 dorsal stripes don’t.  
****Dun** is more likely to cause ****striping** at the ****back** of the ****ears** than nd1.  
Foals with ****dun** tend to have a ****darker lower face** mask, while nd1 foals have a darker forehead.

## Genetics

Bay non-dun1 is the result of a **bay base** with **one or two copies of nd1**. Non-dun1 (nd1) is an allele of the **TBX3** gene.

![CTA Image](https://equinecolors.com/content/images/2025/12/Equinecolors_Icon_DNA1-27.png) 

****Bay nd1:**  
Bay (E/\_ A/\_) + nd1/nd1  
Bay (E/\_ A/\_) + nd1/nd2

Dun (D), located on the same gene, is dominant over nd1, so horses could carry nd1 without it being noticeable but still pass it on.

**Read more:**  
[Chestnut](https://equinecolors.com/base-colors-chestnut/) | [Chestnut nd1](https://equinecolors.com/chestnut-nd1/) | [Black nd1](https://equinecolors.com/black-nd1/)

[Back to Non-dun1](https://equinecolors.com/nd1/)

## Articles

1. Imsland, F., McGowan, K., Rubin, C. J., Henegar, C., Sundstrom, E., Berglund, J., Schwochow, D., Gustafson, U., Imsland, P., Lindblad-Toh, K., Lindgren, G., Mikko, S., Millon, L., Wade, C., Schubert, M., Orlando, L., Penedo, M. C., Barsh, G. S., & Andersson, L.; **Regulatory mutations in TBX3 disrupt asymmetric hair pigmentation that underlies Dun camouflage color in horses**; Nature Genetics (2015)*;* Doi: [10.1038/ng.3475](https://doi.org/10.1038/ng.3475?ref=equinecolors.com)[](https://www.researchgate.net/journal/Genes-2073-4425?ref=equinecolors.com)

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