Any idea in genetics of brassyback / brassback chicken color?

[Tontstee]

Any idea what is the genetics of brassyback? I search and tried dufferent combination but i cant find brassy back.

 

[Chicken_Obsesser]

@NagemTX

 

[NagemTX]

@MysteryChicken may know more than me on this. I've always thought it was over melinized bbr or golden.

 

[MysteryChicken]

Any idea what is the genetics of brassyback? I search and tried dufferent combination but i cant find brassy back.

It can't be made on the calculator, I've tried. It's made by breeding red, or gold Duckwing to black, then back cross to Duckwing. It's caused by the Charcoal gene.

 

[MysteryChicken]

Any idea what is the genetics of brassyback? I search and tried dufferent combination but i cant find brassy back.

Beautiful boy.

 

[MysteryChicken]

Here's Red Brassy Back. She's home bred.

 

[Mossy Dell]

My Morgan whitehackles threw brassbacks from two separate matings this year. I've read up on the genetics and have learned a little, but it's a hard color pattern to research.

Apparently it comes from mating black fowl to reds, greys, and maybe other colors. Just as a white bird can be dominant white or recessive white—or combine both—black birds can carry recessive black and pass it when crossed.

Brassback is based on recessive black, which replaces a strain's usual hackle and saddle colors. Below is a pair from one mating.

Notice the brassback chick here is flanked by wheaten chicks and following a partridge. The black chick's the head stripe shows this is a partridge chick.

Something no one seems to talk about is that brassbacks, just like red or greys, can be partridge or wheaten based. You can see the partridge wild-type pattern of contrasting striping in the pullet's back.

Wheaten brassback females have a white-ish or buff/cream ground color with black hackles and back. Wheaten brassback males tend to carry a lot of white, maybe showing through their hackles. I am not sure if as many have the brassy or gold saddle.

If I mate two partridge brassbacks, I'll get some wheaten brassbacks. All my partridge fowl throw wheaten.

 

[MysteryChicken]

My Morgan whitehackles threw brassbacks from two separate matings this year. I've read up on the genetics and have learned a little, but it's a hard color pattern to research.

Apparently it comes from mating black fowl to reds, greys, and maybe other colors. Just as a white bird can be dominant white or recessive white—or combine both—black birds can carry recessive black and pass it when crossed.

Brassback is based on recessive black, which replaces a strain's usual hackle and saddle colors. Below is a pair from one mating.
View attachment 4210012

View attachment 4210013

View attachment 4210007

Notice the brassback chick here is flanked by wheaten chicks and following a partridge. The black chick's the head stripe shows this is a partridge chick.

Something no one seems to talk about is that brassbacks, just like red or greys, can be partridge or wheaten based. You can see the partridge wild-type pattern of contrasting striping in the pullet's back.

Wheaten brassback females have a white-ish or buff/cream ground color with black hackles and back. Wheaten brassback males tend to carry a lot of white, maybe showing through their hackles. I am not sure if as many have the brassy or gold saddle.

If I mate two partridge brassbacks, I'll get some wheaten brassbacks. All my partridge fowl throw wheaten.

Brassy Back is only Duckwing Based. The Wheaten form is called Furnace.

When you say Recessive Black, you mean Charcoal.
This is the Red Varient.

 

[Mossy Dell]

If charcoal means recessive black, then yes, that's exactly what I mean.

 

[Mossy Dell]

Dug out some of my books:

“In the genetic sense Brassy Back is Black Breasted Red with the addition of the gene for recessive black,” writes Fred Jeffrey in Old English Game Bantams as Bred and Shown in the United States [1991].

Jeffrey notes Brassy Back is a common sport in many strains of black. Best male color is helped by a hen with a “brassy salmon breast,” brassy striping in the wings and back of the hackle, and cushion overly frosted with brass. Avoid breeders with a red or orange cast and stay with the brassy color.

Brian Reeder points out in Color Forms of the Domestic Fowl [2006] that “rb”—recessive black—is not a named gene but a catch-all for the many “recessive melanizers.” Some might be “cha”—charcoal—a recessive eumelanin extender described in the UK, though he has not worked with it. Others could represent “ebonies” described by Jeffrey, “while others may never have been named in any respect.”