“marans dark egg genes are not well studied , so we don t know if they are sex linked or not .
in my experience they are autossomal .they can be pass down from both parent .
the problem we have with dark egg gene are some time they do not appear in the next generation ( they go dormant ) but they reappear in the next generation if we don t outcross the line .
for me I always select the hens who lay dark eggs for as long as they live like my Dark Angel and breed from her /them .I keep both of her/they progeny cockerels and pullets .to cross them to other lines to enhance the egg colour .
peoples always prefer to give credit to a roosters because thy sire a lot progeny but that doesn t mean they pass down more dark egg genes to they progeny better then hens .I prefer hens , with hens I can see the progress of dark egg genes through they life .the rooster does not lay eggs .
if you want to breed marans who can lay dark eggs than incubate only dark eggs ,in few generation you wil have more and more dark egg layer .
one thing dillute the dark eggs genes is outcrossing the lines soo many times .. bad practice.
chooks man”
@wrathsfarm this was Chooks man correcting me once after I said some of the dark egg genes were sec linked, which I suppose is different from what you actually said which was the male was simply more important.
If someone is starting with half siblings all bred from a dark egg male, I’d also predict that egg colour may get darker over generations as those original dark egg genes are shuffled around back to full concentration if that makes sense.