English Chocolate Orpingtons and a Dun Gene?

ZooPro

In the Brooder
May 17, 2021
8
7
11
I have been hatching chocolate chicks from my chocolate roo and hen and I have what seems to be a light, medium, and dark variation. It's clearly three color variations. I've recently been told about the possibility of a dun gene. I'm new to chickens and I need to see pics and learn more about what this could be. Any guidance, pics, examples, info you have would be much appreciated.
 

ZooPro

In the Brooder
May 17, 2021
8
7
11
16B896AA-8250-42E2-86CD-667D489CBB2E.jpeg
 

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Amer

Advocate of Shiloh
Premium Feather Member
Nov 8, 2017
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Yeah, it sounds like your birds are dun as opposed to sex-linked chocolate.
Dun is incompletely dominant just like blue meaning the heterozygotes (dun) have a color in between the homozygote colors (black and khaki.)
Your birds are dun: I^di+ and I^di+
That means the offspring will be I^dI^d, I^di+, and i+i+.
25 percent black, 50 percent dun, 25 percent khaki respectively.
 

ZooPro

In the Brooder
May 17, 2021
8
7
11
Yeah, it sounds like your birds are dun as opposed to sex-linked chocolate.
Dun is incompletely dominant just like blue meaning the heterozygotes (dun) have a color in between the homozygote colors (black and khaki.)
Your birds are dun: I^di+ and I^di+
That means the offspring will be I^dI^d, I^di+, and i+i+.
25 percent black, 50 percent dun, 25 percent khaki respectively.
25% black? I have black orpington chicks from a breeder and my darkest chocolate chicks are still very chocolate when compared to the black. I'll have to get pics for comparison tonight.
 

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