Olive egger true green project question.

[KAGs waterfowl]

Is this how Isbars breed true? I guess the only inconsistency is the shade, but they lay all green. Is that how he did it? Isolating the blue shell under a brown overcoat?

 

[nicalandia]

The last generation that I posted on the top would throw 25% brown coating with a blue under shell, making the eggs green in appearance?

It's much more complicated than that.

You see the blue egg gene is a simple single incomplete dominant gene, but the brown egg color is not, its a polygenic trait.


so it's much better to do this.

Brown egger(dark egger would be best like Marans) rooster x Blue Egger with Pea Comb hen.

F1 green/olive egger back to brown egg parent(F1 female back to dark egger rooster/sire) will yield 50% Olive Eggers and 50% Dark eggers, you can breed the backcross with each other to get hens with two copies of the blue egg mutations.

 

[nicalandia]

Is this how Isbars breed true? Is that how he did it? Isolating the blue shell under a brown overcoat?

That's how it happened. But for true olive eggers it's more complicated since you need to go back to dark egger parents at least once. then isolate the two copies of the blue egg shell

 

[KAGs waterfowl]

Excellent! Thank you, Nicalandia, you have been very helpful.

 

[nicalandia]

Excellent! Thank you, Nicalandia, you have been very helpful.

Please start your project with Pea comb blue eggers like Araucana, Ameraucana and pea comb easter eggers, the Blue egg shell - Pea Comb link is very strong and getting a homozygous pea comb hen(tight pea comb) would mean that she has a 95% chance of also being homozygous for the blue egg shell gene

 

[KAGs waterfowl]

Yes. Thank you!

 

[SpicyDisaster]

...breed the backcross with each other to get hens with two copies of the blue egg mutations.

What do you mean by "backcross", are those the OEs from F1 hen + Brown roo.