wheaten silver columbian whites

[nicalandia]

Hello All
I had read most of the topics posted in this forums, and so interested especially about Autosomal Red,
i am working on my small falk,which consists of some Rhode islalnd reds, some red sex link hens supposed to be ISA brown, and only a light sussex rooster
i am working to produce white chickens ( homozygous for ewh, CO, dominantant white I and sliver)

i started with cross the light sussex rooster x ISA brown hens, as the rir hens have no dominant white I
i got white chick's, they are 3 weeks old now, few of them are completely white without black marks, but the others with black marks,
now the chicks are
homozygous ewh
homozygous CO
some are heterozygous mahogny Mh mh, and others are with no mahogny mh mh
pullets are S+
cockerel are Ss
the white chicks are heterozygous li (dominant white)
and the other with blacks marks have no "I"
i know now to get my goal which is white chickens of genotype
ewh^ewh
CO CO
II
SS males and S+ female
i should cross the completely whites together and the chance will be 25% homozygous dominant white, 50% heterozygous, and 25 with black tails
so the problem
how can i differentiate the whites if they are homozygous or heterozygous
the second issue, the mahogny, how can i get off the red shoulders or how to get rid of autosomal red to prevent red leakage

You have a pretty good grasp of what you are doing.

Basically you are trying to recreate the Silver Line base that is used to create red sex links that have dominant white. I laid out their genetic make up here

Isa Brown vs Amberlink: Understanding the Genetics behind them.​

https://www.backyardchickens.com/th...derstanding-the-genetics-behind-them.1322163/

 

[MysteryChicken]

Light Sussex are Wheaten based

Okay, that's not what I found.

 

[nicalandia]

Okay, that's not what I found.

Do you have pics of the Light Sussex chicks you have that make you believe they could be eb based instead of Wheaten?

 

[MysteryChicken]

Do you have pics of the Light Sussex chicks you have that make you believe they could be eb based instead of Wheaten?

Here's a few 5 week olds.

one of my Partridge based silver Columbian chicks.(Old picture)

I did find one place discussing their genetics also. I'll have to find it. Information is scarce for the breed genetics wise.

 

[nicalandia]

Here's a few 5 week olds.View attachment 2987316View attachment 2987317one of my Partridge based silver Columbian chicks.(Old picture)View attachment 2987318
I did find one place discussing their genetics also. I'll have to find it. Information is scarce for the breed genetics wise.

All of those are Wheaten based(except for the Brahma)

 

[MysteryChicken]

All of those are Wheaten based(except for the Brahma)

Weird, why does it resemble partridge with the leakage?

 

[nicalandia]

Weird, why does it resemble partridge with the leakage?

Not at the chick down level. You need to look at chick down since they hatch not when they are growing feathers

 

[MysteryChicken]

Not at the chick down level. You need to look at chick down since they hatch not when they are growing feathers

Okay, they're a yellow white color.

I did go back to the place I found. I missed a part of the discussion. According to them they're Wheaten based too.

Never mind. Juvenile plumage just didn't seem to fit when I was looking around.

 

[nicalandia]

Double posted same chick down color info

 

[MysteryChicken]

Double posted same chick down color info

I go both. Sometimes down isn't clear enough.

Like my one Brown chick that grew up Buff Columbian of Partridge base.