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They're autosexing. Due to the barring gene. Hens can only have one copy, so are darker. Roosters have two copies, so are lighter. Most breeds that have the barring gene are autosexing. Crele OEGBs, bielefelders, legbars, cuckoo marans, etc.
Let's say you're right; what is the cross? And why would someone make a barred rock hybrid when they could just use the breed's already existing autosexing traits?
The history of the barred rock isn't known as well as other breeds, there's missing details.

Sex-linkage terminology:
#1. Auto-Sexing is sex link trait by which a newly hatched chicks gender can be determined by it's color at hatch.

#2. Sex-link wing feather bud sexing. Method used to determine males, & female chicks apart at hatch by feather bud pattern, & length.
I know these things.
 
Is this a gossip thread, or project thread?
I wanted to drop the subject for now, how many times do I need to ask?
This is number 3, I don't want my thread ruined like the last ones.
 
Agree with @RoostersAreAwesome I was about to say all that too. Barred Rocks are a breed, not a hybrid. For all the reasons that Roosters said above.


purebred
adjective
pure·bred | \ ˈpyu̇r-ˈbred , -ˌbred\

: bred from members of a recognized breed, strain, or kind without admixture of other blood over many generations

hybrid

adjective
Definition of hybrid

1 : relating to or produced from parents of different species, varieties, or breeds a hybrid rosehybrid cattle


From Merriam-Webster Online
https://www.merriam-webster.com/
I know the definitions.
 
The history of the barred rock isn't known as well as other breeds, there's missing details.

Sex-linkage terminology:
#1. Auto-Sexing is sex link trait by which a newly hatched chicks gender can be determined by it's color at hatch.

#2. Sex-link wing feather bud sexing. Method used to determine males, & female chicks apart at hatch by feather bud pattern, & length.
I know these things.
You don't understand auto sexing

Is this a gossip thread, or project thread?
I wanted to drop the subject for now, how many times do I need to ask?
This is number 3, I don't want my thread ruined like the last ones.
There's a common denominator between both threads that caused the issue
 

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