Homozygous vs Heterozygous Extended Black?

[BlueTheBrahma]

One of the breeds I breed are brahmas. I don’t breed them so much for show as my others, more as they’re the first breed I got and I have loads of different (I know they’re not recognised) colours. The flock I have currently is the first generation I have had from a hatch of bought eggs, so don’t know about the ancestry since I hatched out a mixed colour set. My hens are all sorts of colours, which I have asked about before, and my rooster, who I have also posted about, is either a dark splash or unusual blue.

I would like to know if I can tell if he is homozygous or heterozygous for the extended black allele. I plan to sell the hatching eggs as colourful brahmas, but if he is homozygous for this dominant allele, all the offspring will be blue and splash (and possibly black).

He has a lot of gold leakage, which someone once told me may be because of partridge ancestry, but I’m not convinced this is true, or if his leakage is anything outside of the typical splash rooster. Could being heterozygous result in his darker colour, or is there any other way to tell. I’m assuming not but am hoping since all the colours I could get from the crosses with my unusual hens would be great if duckwing, partridge and wheaten could be expressed.

 

[nicalandia]

He could be Heterozygous for the extended black mutation, but not likely as E/eb Pg/pg+ from a partridge ancestry would make him a solid color. The leakage is mostly coming from him losing Melanotic/Patridge linkage that is often found on Extended black birds. you see Extended Black on itself does not guarantees a solid black bird.

Or he could also be E/eWh heterozygote.

 

[BlueTheBrahma]

Not posted for a while but thought I’d update. After trying six times now to hatch from him it seems blue is infertile. Keeping him since he was my first chicken. After moulting, he has lost some leakage but looks no darker.