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Taken out of the Internet.

There are a few links with research done on Sexlink Extreme Dilution B^Sed https://www.researchgate.net/figure/Phenotypes-and-alleles-at-the-Sex-linked-barring-CDKN2A-locus-in-chicken-A-Female_fig2_341351511

https://www.backyardchickens.com/threads/55-flowery-hen-recipe.1255363/post-26386596

Possibly. Currently the B^Sd and B^Esd have only been found on White Leghorns(Production and Research lines). 55 Flowery Hens can trace their lineage strait from Leghorns.

I posted a pic of a ghost barring chick(may or may not carry the B^Esd mutation)

Correct.

Nearly White, Ghost Barred

There are at least three allelic mutations found on the sex linked barring allele. b+ = Wildtype found on red junglefowl B = Sex linked Barring also known as B1 B^Sd = Sex liked Dilution. Also known as B2 B^Esd = Sex Linked Extreme Dilution. Also known as B0

Indeed

I am not an SOP type of guy but I would say that the result of a well planed breeding strategy that ends up with birds that are at least 7/8 Sussex would be very much a Sussex in Type and form, of course if the starting stock was very good to begin with I very much agree with The Moonshiner...

I would agree with that, Brussbars were never accepted even if they were just autosexing Sussex, perhaps they should of just have called them Crele Sussex when they were created and have them accepted?

I agree, I would call them "Flowery Sussex" :pop

I've been trying to get that point across since I started posting on this thread, Speckled Sussex has all of the genes required for your goal, except sex linked barring, introducing the sex linked barring gene from an Autosexing breed would be the best approach since they have e+ and B/B...

I believe you are too confused at this time, first why are you abandoning the Speckled Sussex background? Why getting rid of Columbian? Columbian has not effect on the Autosexing traits of the chicks. Why the use of Mottle Java? Bielefelder Rooster x Speckled Sussex Hen = e+/e+, Co/co+ s+/s+...

Speckled Sussex is the one that has e+ and mottling so adding sex linked barring will be required, I believe the OP wants a a pattern close to 55 flowery hen, but on a Speckled Sussex background, also I would like to point out that genes like Columbian, Mahogany mottling, Columbian have no...

How to introduce the sex linked barring gene without affecting the Sussex type will be required Here is my example using a Rhodebar. This cross would yield Rhodebar looking females(red columbian barred) and Single barred Rhodebar looking males, both progeny will have recessive mottling hidden...

Going with the OP statement what he/she is basically wanting is a Flowery type speckled sussex, and as I have mentioned earlier Speckled Sussex already have the wild type e+ e allele and the recessive mottling gene(e+, mo), other genes like Columbian, Mahogany and sex linked gold(Co, Mh, s+)...

Correct, the good news is that you already have recessive mottling and the e+ wiltype e allele found on sex linked breeds like Rhodebars, Legbars, all you need is to source the sex linked barring gene and to be honest you can source it from any breed, Barred rock would be my best bet, the f1s...