Originally Posted by ChicKat
Hre is an internet quote:
||Females that are hemizygous for BSd (having one BSd gene) have light blue and barred plumage as do the heterozygous males, however, homozygous males show a dosage effect and are essentially white. These homozygous males resemble dominant whites but differ in that they are epistatic to pheomelanin while dominant white is not.
It made me wonder if the ultra light CLs could have some dilution going on via their barring gene. It also made me wonder if there could be some tie in with the white CL when the person writes that 'homozygous males show a dosage effect and are essentially white. ---
for those who love the nitty-gritty of the genetics -- an avenue you could delve into if you wished.
The B^sd baring makes the males nearly white. Below is a California Grey cockerel with the B^sd gene. They are supposed to have white cockerel and barred females. This cockerel still has a lit of color so I am not sure if it is correct for the breed (and the B^sd)
I haven't got any reliable genetic information from the Norwegian Jaerhon breeders but think that the light variety imay be built on the B^sd (?). At any rate the group below show a cockerel that I think would fit the B^sd description. The female look like dark Jearhon (i.e. not B^sd)
Here are some varified B^sd birds
This is a pullet and the breeder said that the B^sd is what is causing 50% of the tail feather to be white. The breeder said that the base is always white with this barring but the tips are darker.
Here is the cockerel from the same breeder as the pullet above. The B^sd is compared to the splash in a double barred B^sd cockerel.