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Californias may be dominant black which means it doesn't matter if they are agouti or nonagouti.

I dont know, but with all the fur pulling i thought about missing melanoblasts in hair follicles too. There is a bulge region where they sit and wait to populate the follicle with new melanocytes for each new hair. If they are gone (f.e. in silvers) -> white hair.

I think it may be these 8 similar looking rabbits (id 752 - 759) http://rabbitcolors.info/int/en/entries/B_D_eJ_En-_du/1.html maybe i should change there gene code.

If i remember correctly this Tri dutchs was from germany. There its not allowed to mix colors, so you have black tris with noting else. So if you want nice tris/japanese without need to look at agouti or fuss with smut, keep them beeing eJeJ ;-)

I disagree with this. It's only true for heterozygous eJ e ones. For true breeding eJeJ harlequins it doesn't matter, which A allele they have. eJ create receptors which make dark color all the time in dark parts. In yellow parts there are no Extension receptors at all, so they can not interact...

ERE / epizootic rabbit enteropathy / Clostridium perfringens?

You could use http://rabbitcolors.info/ to lookup images with gene codes, but first read the help page to learn how to use the database!

EJE is a mosaic of normal agouti + steel rather than yellow + black, so yes, they can have bands too. Again this nice guy:

Someone liking black agouti satin wool calls the color marzipan.

@Alaska Satin any change could you try to make the owner get a nice side image on a neutral background? I used to explain the color series using tan rabbits (and i still miss a black at ch one). Now i have the idea to use black harlequin for this :-)

Its strange that it looks "normal" steel rather then black with very little agouti hairs, considering it beeing ESe. Can this thread be moved to the genetics forum?

Do you by chance have a microscope? If yes, look at some hair if you can see uneven color distribution, which would say dilution.

Yes, but it behaves more like ES, so EEJ look like a mosaik of agouti and steel. And thats also, why agouti doesnt matter in eJeJ ones - there are no receptors in light parts. yes, f.e. in californians, checkered giants and NZW. And i think there is an american breed coming in blue/white/red...

Do you mean AEww versus AeeW?

There are rabbits withoutMC1R receptors, looking pale yellow:

if you are interested in how agouti + eJ are working, look here: https://rabbittalk.com/threads/function-of-agouti-and-extension-genes-about-receptors-and-pigment-types.37081/

The yellow of rusty back is in the pheomelanin band, which is normally white in chin.

yes, the agouti band has nothing to do with brown b chinchilla do not influence the banding itself, but the color of the agouti band looks like steel to me. There is nothing preventing steels to be silvered too and there are silvers with fairly few silvering. ESe would have way fewer ticking...

The agouti band in guard hairs is usual lighter as in down hair.