Post by gayle on May 26, 2012 23:11:45 GMT -5
Quote from Dr Ron Okimoto
I've developed molecular tests for e+, eb, eWh, E and two ER alleles. For these alleles we can tell genotype by blood test.
On a basic wild-type genetic background you can tell wheaten, E and ER in both sexes when they are homozygous. The e+ and eb males look the same, but the females look different.
Wheaten males are black breasted red (BB red) with a white feather undercolor. All other E alleles have a gray undercolor. Females are wheaten
E males are nearly completely black and so are the females.
ER males look BB red, but lack the red in the primary flight feathers. Females have black bodies with colored hackles.
eb males are BB red. Females have the brown stippled bodies.
e+ males are BB red. Females have the salmon breast and brown stippled back.
Sex-linked silver can turn the brown to gray.
There are modifiers that will make ER and eb totally black. Black Old English are based on birchin and Black Wyandottes are based on eb. The undercolor of the eb blacks often changes to white, so some of the black enhancers must have the opposite effect on the gray undercolor.
e locus by Dr Ron Okimoto
When you bring in other modifiers this all falls apart. E and ER are least affected by Co (columbian). e+ is affected by Co, but not as much as eb is. This is why columbian restricted breeds are usually eb. Wheaten and Co are like New Hamps and people usually like more black in the hackles of the birds than wheaten allows. Wheaten columbians have less black in their bodies and you often find it segregating in columbian restricted birds like Light Brahma. Wheaten columbians have the white undercolor when homozygous.
You'd have to write a book about how the E locus interacts with all the other feather color genes.
I've developed molecular tests for e+, eb, eWh, E and two ER alleles. For these alleles we can tell genotype by blood test.
On a basic wild-type genetic background you can tell wheaten, E and ER in both sexes when they are homozygous. The e+ and eb males look the same, but the females look different.
Wheaten males are black breasted red (BB red) with a white feather undercolor. All other E alleles have a gray undercolor. Females are wheaten
E males are nearly completely black and so are the females.
ER males look BB red, but lack the red in the primary flight feathers. Females have black bodies with colored hackles.
eb males are BB red. Females have the brown stippled bodies.
e+ males are BB red. Females have the salmon breast and brown stippled back.
Sex-linked silver can turn the brown to gray.
There are modifiers that will make ER and eb totally black. Black Old English are based on birchin and Black Wyandottes are based on eb. The undercolor of the eb blacks often changes to white, so some of the black enhancers must have the opposite effect on the gray undercolor.
e locus by Dr Ron Okimoto
When you bring in other modifiers this all falls apart. E and ER are least affected by Co (columbian). e+ is affected by Co, but not as much as eb is. This is why columbian restricted breeds are usually eb. Wheaten and Co are like New Hamps and people usually like more black in the hackles of the birds than wheaten allows. Wheaten columbians have less black in their bodies and you often find it segregating in columbian restricted birds like Light Brahma. Wheaten columbians have the white undercolor when homozygous.
You'd have to write a book about how the E locus interacts with all the other feather color genes.