crossing two barred breeds getting a surprize

[centrarchid]

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I guessed that what was case when they could be feather sexed as chicks last year. They got an extra dose of barred rock or black java somewhere.

 

[centrarchid]

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Autosomal slow feathering based on observation all dominiques, regardless of source, put on feathers more slowly than a similar American / Old English Game. It is not a sex linked attribute. I have not measured feather development directly but seems obvious.

This is one of primary regions I chose for introgression of game into a dominique line.

 

[centrarchid]

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I have a couple papers they say something similar. I will read this over a couple times more. Gut says multiple loci might effect barring. That is why several crosses being made. Hope is to have a loci that can keep barring crisp even with fast growing feathers typical of game.

 

[Chris09]

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I have a couple papers they say something similar. I will read this over a couple times more. Gut says multiple loci might effect barring. That is why several crosses being made. Hope is to have a loci that can keep barring crisp even with fast growing feathers typical of game.

If I remember right the Black and Gene 'K' are the only thing that will clean up barring.

Chris

 

[centrarchid]

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I have a couple papers they say something similar. I will read this over a couple times more. Gut says multiple loci might effect barring. That is why several crosses being made. Hope is to have a loci that can keep barring crisp even with fast growing feathers typical of game.

If I remember right the Black and Gene 'K' are the only thing that will clean up barring.

Chris

I am hoping more genes involved. I find it difficult to believe such a small number of loci involved. Making multiple crosses as be ing made should be effective method to explore for more loci.

 

[centrarchid]

Chris,

I read your post of David Scrivener bit several times. And then a couple more times. I can not figure what is going on with Privett Dom x California greys in respect to barring. Males and females look too much alike. What do you think of possibility that a barring gene allele coming from California grey is autosomal?

Cross has been repeated as indicated earlier using to strains of pure (1 is show and other is Cackle Hatchery) dominique. If pattern repeated, then somehow even females getting double dose of barring gene from father. Could it be that that duplicate copies of loci coding for loci exist on Z-chromosome?

 

[Henk69]

Why wouldn't a male with one copy resemble the female with one copy?

 

[centrarchid]

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They should resemble each other if both sexes have only a single chromosome with barring gene but both breeds are supposed to fixed for barring gene on Z-chromosome . Therefore, in this case of dominque crossed with California grey, if cross is male there should be 2 copies of barring allele and if female 1 copy. Henk. it was you that noted the male and female versions of cross can not be differentiated. I agree they can not be differentiated like similar aged pure American dominique or California grey. Females should appear much darker.


Either some modifier is at play or another loci codes for barring. I am guessing latter since dark and lite bars are of similar width in both sexes. If latter so then couple possibilities exists, second loci for barring on z-chromosome or it is autosomal.

 

[Henk69]

California grey should have another barring allele at the same gene.
If they are pure they would be almost white.

 

[centrarchid]

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As I understand what you have written, you mean homozygous for barring allele. Yes, they are pure.

What I suspect is intead of having one locus (gene) that is homozygous for barring, they may have two loci (genes) both homozygous for barring. That would enable F1 cross involving male California grey as sire to have two copies of the barring allele producing a phenotype that appears as a homozygous male dominique would look.