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Big can of worms...
I think this has been discussed before, and it mainly comes down to the fact that Marans have attractive eggs and complicated genetics.
Some folks breed just for dark eggs - their birds will eventually deviate more and more from SOP. They still sell their eggs to folks as true Marans.
Some folks breed for show - their birds may not retain the genetics for dark eggs. You don't have to show an egg with the hen, and how would you test a roo?
Hormones have a big role in how a bird colors out. A hen and roo with identical genes will color out very differently. In general, hens will darken up more easily.
Snowbird has mentioned that most breeders that have a variety of chicken where the hen and roo are at all different, if they want to breed to SOP, will have a separate breeding program for hens and for roos. I believe he called them parti-colored birds. Any self colored birds - black, white, buff etc. would not need this kind of separate breeding pen for hens or roos.
I believe very few Marans breeders are using this technique at this point. I know Geebs has been breeding for hens and roos separately.
So a flock of BC Marans in your backyard will rarely produce good hens and good roos consistently. Very dark egg color genetics are just now being studied, and are not well understood.
There are egg color inhibiting genes, feathered shank inhibiting genes, etc... things that hide the good genes that your birds have and don't allow them to express. Some of these genes are recessive and hide in your flock. Then one year, your best roo and best hen might start producing birds with clean shanks or just stubs for example. What do you do? Start over?
It is a complicated breed to get everything right. Carnation combs and comb sprigs are also complicated genetically, and hide in a flock until the right combination of two different genes is there. Then it presents. That is why even though the breed has been in the U.S. for years, there are still many issues being cleared out of flocks... and they will continue to persist in open flocks.
But the process, although challenging, is fun to be a part of. Here in Europe we have a lot of the same challenges, though I don't think we have sprigs here.
That's my 2 cents on this.
MATH - thanks for the pics - you got my wheels turning... at 5 am this morning! Great ideas.
Wow ... so much to learn, and ya'll teach me something new every day, and it seems that things keep changing every time I turn around! How long has it taken you all to learn ALL of this! LOL
My mind sometimes gets into a muddled mess, especially when it comes to genetics at times when I sit on here reading page after page about it! I think I got something down, then I read what someone else says and it seems like what I thought I knew I didnt really understand so well and then back to that subject I go to re-read!
Then the standard for this breed just keeps changing! GRRRR! So whats your alls advice to keeping up with the changes,
how long has it taken you to get this far,
suggestions for wanting to learn to breed and keep this breed in standard as not as muddled as those genetics get my mind sometimes!
WHY CANT THERE BE A MENTOR AROUND ME?????
Seeing first hand is the way I learn best - I AM hands on with all our farm animals, and sometimes looking at a picture and then running outside to compare it to your bird, just doesnt work. *** ok yeah you probably cant answer that one I was just venting there!

***
What breeders
are reputable? (Yes know before you buy!!!)
Reading this page here and the comments made a lot of sense to me, about someone saying "I've got so and so line" but how far removed are they? THAT made LOTS of sense!
AND then that brings the question, why cant a breeder who doesnt have "THOSE" lines of birds (or further removed) become a successful breeder - with quality birds, within standard - that can play ball with the other players in the field? Why does EVERYONE want and have to have JUST those lines and SO close to them as possible?
Can you not make good birds out of a further removed line?
And whats the best way to keep this from happening (not getting birds from someone that is so far removed down the genetic pool) - how can you NOT become one of those people when you breed Marans?
Yeah I'm new at this and learning - I dont post a lot and when I do its probably a silly question, but wow, you guys are so chocked full of information! LOVE that - and I guess I'll never know if I dont ask!
I dont go into something half cocked and unloaded - I have to know the whole kit and kaboodle! Which I think a lot of people with chickens who want to hatch DONT. You cant be a serious breeder without serious knowledge and TIME, TIME, TIME. That I have learned and of course common sense will tell ya that! It seems tho, this gorgeous breed is so much more complicated than others I have seen and read about.
What makes you GOOD? In other words, what do you all, as a breeder, strive for to get in that same playing field with Breeders like Bev Davis?
Do any of these questions make sense? Or am i just annoying?