|For cocker spaniel breeders we have always discussed the agouti (sable/tan)
genes and refer to them as ay and at while it is
a little more complex than that, there are obviously multiple modifying
genes (genes that modify agouti sable, at present are also called sable:
interspersed ay and banded aw) or other unknown genes
Because Brindle and Recessive Blacks are rare enough to be nonexistent
(or are unrecognized?) in American Cockers they will not be included here
Why the old formula (A ay and at) still works:
Being we Cocker Spaniel breeders always refer to all agouti genes as;
sables are ay , tan-pointed are at here's an
A dominant black = equals KB dominant black
ay sable = equals kyky recessive yellow
plus agouti ay sable
at tan-pointed = equals kyky recessive
yellow plus agouti at tan-pointed
To be solid (black) your Cocker Spaniel must always have at least one
KB gene, the same as the old A gene
For either sable or tan-pointed to be visible it must have two ky
genes, the same as the old ayay, ayat
I.E. you are dealing with only two genes, KB dominant (black)
and ky recessive yellow (sable).
The ky (yellow having two Agouti modifying genes ay
and at (tan-pointed).
Then there are genes that effect how the agouti sable is expressed,
as interspersed light and dark (ay) or banded (aw)
whether it also effects tan-points, don't know? never checked!
|| < agouti genes
|| genes that possibly modify
This is the equivalent of dealing with three genes on the same locus.
Works the same as the old formula made universal in "The Inheritance of
Coat Color in Dogs" by Clarence C.Little,
and the old Agouti only formula will give the same nearly results;
all on the Agouti Locus, A (dominant black) ay (recessive
sable) and at (recessive tan-pointed).
The only caveat to using the old method is, a black Cocker will
always carry either of two sable/tan-pointed genes as opposed to the one
we had learned to expect
(the stranger in the wood pile effect)