Color Genes for GSD's - Page 5

Dominant Black in GSD is a Russian "mystery"

Dominant black is really the only possibility here--I would test the female and the puppies if possible. Really interesting case--would love to see the pedigree on the female. Does she have a line of black ancestors going back through each generation?

I'm surprised you'd call Cassie's expression black bleed-through, not and not bicolor.  But I'd go with your feeling about it.  I guess for explanation of the expression, that leaves option 2 unchanged, and change option 1 to a NON-bicolor modifier still acting on a homozygous pair of recessive black  alleles at agouti locus.  About the same.

The DNA coat color tests are back for the young black female I described earlier.  She is BBEE not carrying b or e.  As I understand VetGen's explanation,  EE is the black mask and BB is from the K locus and indicates that she is dominant black.  

Gayle

http://vetgen.com/canine-coat-color.html
EE would be non cream. ee dogs are White/Cream/Red with no black hair.
BB would indicate she does not carry liver.

You may have ordered the wrong tests. On the one hand you now know she does not carry white or liver but must re-test K locus and Agouti locus. 

K=?? (Kb Kb or Kb-k) (Dominant Black)
A=??(aa) Recessive Black 

This Explanation E showing black mask is Confusing, It just means that to express a black mask or any agouti pattern the dog must carry one copy of E, Being Ee or EE and not being ee.

Examples of bb dogs are Red Dobes and Chocolate Labs and Liver GSD.

Thanks.  Guess I didn't understand.  The K locus results were  "KBky may or may not contribute fawn/sable".  Still waiting for more results.

KBKy would be Dominant Black!

That's a heterozygous dominant black.

Would you share the pedigree on her?

I'm pretty much positive that the black conformation dogs we're seeing from Russian bloodlines are dominant black--all coming from this dog and his father's motherline--note the unbroken line of black dogs. Much like when you trace sable in a pedigree, you will see an unbroken line of sable ancestors because it is not recessive to black/tan or (recessive) black in GSDs.

Christine

The father is Gabe Haus Juris (Liedo Kuckucksland) all well-known high lines in pedigree.  The mother's pedigree is a mixture of many things.  Looks like the black is coming through the mother line:  Sheldon's Raina of Char-Will (black); Char-Will's Bell of the Ball (black); Megan-Cha Will (black); Sherjak's Midnight Tango (black); Sherjak's Midnight Jamboree (black).  This is an unbroken mother line on the bottom of the pedigree.  The maternal grandfather is a mixture of Czech blood going back to Bill z Viktorovho (Mutz/Quanto lines) on his father's side, and Henning van Noort, Filla Larchenhain, Arko Monchberg on his mother's side.  The dam's mother line also goes back to Clint Trompetersprung (Fanto Hirschel).   The female herself (Sheldon's Zuri) was shown at the recent North Carolina regional show under Rudiger Mai.  In a big class, she placed second behind her half sister (also a Gabe daughter), and briefly ran in first place.  She has an excellent forehand structure (as did all 11 pups in the litter--5 blacks), croup could be longer, normal rear angulation.  An eventual V-rating should be easy for her.  Working drives are solid and balanced.  She'll be shown at the USA Sieger Show in serious competition!  Hope her color won't be prejudicial.

Can you post pics of the pups you say are "brown" and"red"?