The Chicken Calculator and the appearance of CL

[K3]

This is from a post in the White Sport thread on BYC:

Henk is a genius   here is another of the calculators

http://kippenjungle.nl/Overzicht.htm#kipcalculator

ETA - Okay-- after putting up that link...I went to the Chicken calculator -- Tim Adkerson had given me some genetic information regarding Cream Legbars -- long time ago....

Crested Cream legbar (CCL) are wild type (gold duck wing), sex linked barred, and carry the cream gene. They also carry a form of autosomal red.

and the genes he listed are e+/e+, s+/s+, B/B or B/w, w/w, Id/Id or Id/w, Cr/Cr, O/O -- the Id, Cr and O don't show on the chicken calculator...

Plug these genes in -- or start with the gold duckwing and add barring B/Bfor the male; B/- for the female s+/s+ for gold, and ig/ig for cream....when you calculate you will get an image of the Cream legbar that some are calling 'gold' -  Then go to the S-locus and swiitch out the s+/s+ for S/S and you will get the cream legbar that some are calling 'true' because of genetics....but actually..... it's silver.  

Go to the barring genetics B-locus and switch B/B to B^sd/B^sd and look at what happens.  A female of this genetics has what is called ghost barring and it is very rare but the male appears WHITE  SO if your female haS ghost barring -- perhaps that is the source of the white CLs- but I haven't heard of ghost barring so I doubt that it is....isn't that just fascinating?  

[K3]

That was an older link to an earlier chicken Calculator...BTW - it worked for me because I had cookies on my computer -- this is a much better link to an updated chicken calculator.

http://kippenjungle.nl/kruisingCQ.html?mgt=&fgt=&

[Kestlyn Penley]

Those are cool calculators!

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[Curtis Hale]

The [B^sd] barring is found in the California Grey Breed.  I don't know of any other breeds that require this type of barring, but am guessing that the Light Jearhons may be [B^sd] white dark Jears are [B].  You can look up photo of California Gray and Jearhons.  You will she that that they are NOT self white.  They are even a little more colorful that a splash or a single dosage of Dominate white over an extended black bird. 

 

The white sports that we see in the Cream Legbars is the recessive white gene.

 

The genetic calculator is a good way to learn the genetic nomenclature and of course "Calculate" probabilities from stock of know genotypes.  The illustrations are NOT true representations of how many of the genes work though.  For example the Dilute gene [Di] is a sex influenced gene.  It has no diluting effect on cockerels that have a single copy of it, but hens that have a single copy of it will have partial dilution with only one copy of the gene.  Both the male and female with two copies of the gene will have the full dilution for the gene.  However, the gene calculator show full dilution on both the cockerel and hen when a single Di gene is selected.

 

Other gene that I know all of the Cream Legbars breeders are going to play with is the Cream Gene.  It shows the Cream gene as only diluting the male and female with two copies of the gene, I head a report of a Master breeder of another breed (not cream variety) being able to tell which of his birds were carries of cream (i.e. only one copy) because they feather color would be slightly different that those that didn't carry cream.  The genetic calculator is not intended to show these nuances. Also the Genetic Calculator doesn't combined dilutors.  For example if you select Cb, Di, and ig you should have a triple diluting, but the gene calculator one show a single dose of dilution.   

 

Also the gene calculator show the red enhancement (red on the shoulders of the cockerels) as default for gold breeds and not red enhancement (lack of red on shoulders of cockerels) as default for silver breeds.  Both can have red enhancement or no red enhancement.  Changing the selection of [Ar] has no effect on the illustration.  So...learn your genetic nomenclature and probabilities on the Chicken Calculator is a good way to do things, but learn how these various genes are expressed in birds will require photo or live observations of chickens with known genotypes.