wheaten silver columbian whites

[Zawisty]

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

 

[The-White-Elephant]

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

@MysteryChicken @NatJ @nicalandia

 

[MysteryChicken]

@MysteryChicken @NatJ @nicalandia

I'm already here reading the post.

 

[MysteryChicken]

I'm not completely sure, but I think Light Sussex are Partridge based Silver Columbian like that of the Brahma.

 

[Zawisty]

I'm not completely sure, but I think Light Sussex are Partridge based Silver Columbian like that of the Brahma.

most of the people discussed light sussex they said ewh,

 

[MysteryChicken]

I'm not an expert on dominant white, but I know that it's abit difficult to prevent leakage of certain colors, like red, or occasionally black.

I believe black helps the dominant white color be more even, & have less leakage. I maybe wrong though, but not quite sure.

 

[MysteryChicken]

most of the people discussed light sussex they said ewh,

Looking at juvenile plumage of the Light Sussex shows some partridge patterning on the backs. But not all chicks will leak pattern in juvenile plumage.

But I can do some more digging around, to double check.

I don't know tons about the breed.

 

[MysteryChicken]

They are Partridge based Silver Columbian.

 

[NatJ]

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

The traditional way (even before people understood how the genes work) is to just breed from the most completely white birds in each generation.

The Ii birds (heterozygous Dominant White) are more likely to have bits of black leaking through, and the II homozygous birds are more likely to be completely free of black. If you want to be sure, you can test-mate individual birds to ii birds (Light Sussex father or Rhode Island red would be suitable mates for testing.) If a given bird produces any chicks that show i then of course they have i, but producing 6-8 chicks that all have I is a pretty good indicator of being homozygous for I. (If you're not familiar with calculating probabilities, the chance of getting that many chicks with I from an Ii bird is 1 in 128 for 6 chicks, 1 in 256 for 7 chicks, 1 in 512 for 8 chicks. The more chicks you hatch, the more sure you can be.)


For the red leakage, if you have any birds with no red leakage, you could obviously choose to breed from them. Just hatching a large number of chicks in your second generation might yield some with no red leakage.

If your original Light Sussex rooster does not show leakage, you could cross daughters back to him, and pick the offspring (both sexes) that have no red leakage. That cross could potentially give you some Ii birds with no red leakage (might show bits of black leakage), and then you would breed those together to get some II birds (hopefully with no red leakage or black leakage.)

Many breeds have the main color genes that we know about, plus some other genes that are not named or properly understood that modify the expression of the main ones. Crossing back to either parent breed could pick up more of those unknown modifiers (probably more useful on the Light Sussex side than the Sexlink side, but might be useful either way.)

 

[nicalandia]

They are Partridge based Silver Columbian.

Light Sussex are Wheaten based