The Olive-Egger thread!

[Ihilani Coffee]

Quote: It seems from reading that the only way to assure olive eggs is the F1 cross with pea combs? The F2 (backcrossed to Marans) may lay brown eggs if the original blue egg side had only one blue egg gene, correct? Any F2 that have pea combs "should" be OE and single combs ought to be culled as they will most likely (or 100%?) lay brown eggs?

 

[nicalandia]

Quote:
you are correct,

 

[Ihilani Coffee]

Quote: Same with all successive generations, just keep the pea combs?

 

[nicalandia]

Same with all successive generations, just keep the pea combs?

Yes, you will have about 90% chance of the blue egg shell gene linked to it(pea comb)

 

[farmhand]

Yes, you will have about 90% chance of the blue egg shell gene linked to it(pea comb)

Not that I want to try this; if you would test the DNA looking for the the blue gene, it could be found without the pea comb linked to it? But you you find them together 90% of the time?
Or are they linked?

 

[chicken pickin]

Not that I want to try this; if you would test the DNA looking for the the blue gene, it could be found without the pea comb linked to it? But you you find them together 90% of the time?
Or are they linked?

They say the blue gene are closely linked to pea combs which is why we all seem to keep the EE and OE with pea combs. But we also know now that the blue gene is also carried by cream legbars which are straight combed birds(with lineage to pea combed birds) but these chickens go against what we all think about the blue gene.

 

[nicalandia]

Not that I want to try this; if you would test the DNA looking for the the blue gene, it could be found without the pea comb linked to it? But you you find them together 90% of the time?
Or are they linked?

they are linked by like 3 centiMorgan which is very very close, chances of crossing over to the single comb gene(the O gene crossing over the p+ gene) aver very small, maybe 4 or 5% at most

and before anybody could say anything about the CL, the Chilean stock that was used by Dr. Punnett were single combed birds,

 

[nicalandia]

They say the blue gene are closely linked to pea combs which is why we all seem to keep the EE and OE with pea combs. But we also know now that the blue gene is also carried by cream legbars which are straight combed birds(with lineage to pea combed birds) but these chickens go against what we all think about the blue gene.

the Chilean stock Dr. Punnett used to creat the cream Legbars had single combs, in South America you can find single comb stock that lay bue eggs, but thats becuase the blue egg shell gene(O) crossed over to the p+ gene(single comb)

 

[chicken pickin]

the Chilean stock Dr. Punnett used to creat the cream Legbars had single combs, in South America you can find single comb stock that lay bue eggs, but thats becuase the blue egg shell gene(O) crossed over to the p+ gene(single comb)

Ah interesting I didn't know that. But I don't really understand the different links in the pea comb and single comb when it comes to the blue eggs gene.

 

[nicalandia]

Ah interesting I didn't know that. But I don't really understand the different links in the pea comb and single comb when it comes to the blue eggs gene.

they are located on the same chromosome(end of short arm of chomosome1)

you can read more about linkage on this page done by one of my mentors. http://www.edelras.nl/chickengenetics/linkages.html

and a study and genetic Sequence of said linkage(birds used, Araucana, white Leghorns and R.I.R)

download the PDF file
https://www.sciencebase.gov/catalog/item/50538bede4b097cd4fce314f