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I'm sure you are not being ignored, but many here may not have any access to the Blue Birchens to know off hand. Blue Birchen would be the dilute of Black Birchen, both having the silver ER gene as apposed to the gold ER gene of the Black/Blue Coppers. Forgive me, I'm still trying to choke all of this down, and you seem to have, from other posts by you that I've read, to have a far better understanding than me!
The Birchen gene is just the silver gene replacing the gold gene. BCM=gold gene; BlkBirchen=silver gene. Same for the blues. So the Andalusian blue factor would fit here as well, as long as the birds you are breeding the Blue Birchen to are TRUE blacks, blues, and splashes; NOT those mentioned with hidden copper genes. If you breed a Blue Birchen to a Black Copper that phenotypically looks pure black, you will now have a silver AND gold gene, and it may appear as a tainted silver tone in the hackle color. OK, now that I stuck my neck out here, let's here from the pros!!
This is just my take on it, and I am FAR from even beginning to understand chicken genetics!
Great job Debbi, that's exactly what I would have mentioned. What's that they say about new tricks? Someone's been doing their homework!Extended Black based BBS dominates over ER so you will lose some of your birchen hackle/saddle in offspring. Silver is sexlinked, so the hen offspring would still be silver BBS/Birchen hybrids, but the rooster offspring would be silver/gold mixes. You won't get anything pure from this combination. The genetic makeup of a pure BBS Marans is different than a Birchen. It would be like breeding cuckoo to wheaten, you don't get anything that breeds true, or that you could offer to anyone as a pure Marans.
Holy cow!! I actually got it right??
Thanks VC, the "new tricks" are evidently slowly seeping in, so the old dog can learn afterall!
I'm sure you are not being ignored, but many here may not have any access to the Blue Birchens to know off hand. Blue Birchen would be the dilute of Black Birchen, both having the silver ER gene as apposed to the gold ER gene of the Black/Blue Coppers. Forgive me, I'm still trying to choke all of this down, and you seem to have, from other posts by you that I've read, to have a far better understanding than me!



Great job Debbi, that's exactly what I would have mentioned. What's that they say about new tricks? Someone's been doing their homework!Extended Black based BBS dominates over ER so you will lose some of your birchen hackle/saddle in offspring. Silver is sexlinked, so the hen offspring would still be silver BBS/Birchen hybrids, but the rooster offspring would be silver/gold mixes. You won't get anything pure from this combination. The genetic makeup of a pure BBS Marans is different than a Birchen. It would be like breeding cuckoo to wheaten, you don't get anything that breeds true, or that you could offer to anyone as a pure Marans.
Holy cow!! I actually got it right??

