I was just wondering what other horses are true dominant bays.
I know Seattle Slew is but do know know for sure of others.
It doesn't matter what year they were born either.
Just a little research thing I want to do.
Dominant bays..
Moderators: Roguelet, WaveMaster, Jorge, Sunday Silence
-
xfactor fan
- Breeder's Cup Winner
- Posts: 2212
- Joined: Thu Sep 16, 2004 8:46 pm
There are two things going on.
Base coat color and Agouti.
Seattle Slew carried two copies of the Black base coat color gene, so the color gene he passed on was Black.
He was a brown horse, so he carried two copies of the recessive version of Agouti. The dominant version of Agouti pushes the black pigment to the outer edges of the horse, leaving the middle of the horse brown (Bay) There seem to be two recessive versions of Agouti, one that produces a black horse, and the other a brown horse. The brown version seems to be more recessive than the black version.
The latest research seem to indicate that the brown version is a modifier lurking near the Agouti gene, so they are passed on together. One of the color testing places now offers a test for brown, and seems to have found either the gene, or a marker for the gene.
Getting back to Seattle Slew, he was EE (Black-Black) at at (Brown-Brown) and since at is the most recessive of the genes at the Agouti gene location, any time the mare contributed a dominant version of Agouti, the foal would be Bay. Meeting the recessive version of Agouti (a) would result in a black horse, and a (at) would produce a brown foal.
So while he was a true breeding black horse, he wasn't a true breeding bay.
Northern Dancer carried both the Red and the Black color coat genes, but most of his black based are bay. He's got a couple of foals registered as brown, and a few as Dark Bay/Brown, whatever color that is.
So he carried the dominant version of Agouti, and the least dominant version.
A true breeding Bay would be one that carries two copies of the dominant version of both the black base coat color, and two copies of the dominant version of Agouti.
Other than getting any given horse tested, the way to tell is that a true breeding bay could only produce bay foals.
Base coat color and Agouti.
Seattle Slew carried two copies of the Black base coat color gene, so the color gene he passed on was Black.
He was a brown horse, so he carried two copies of the recessive version of Agouti. The dominant version of Agouti pushes the black pigment to the outer edges of the horse, leaving the middle of the horse brown (Bay) There seem to be two recessive versions of Agouti, one that produces a black horse, and the other a brown horse. The brown version seems to be more recessive than the black version.
The latest research seem to indicate that the brown version is a modifier lurking near the Agouti gene, so they are passed on together. One of the color testing places now offers a test for brown, and seems to have found either the gene, or a marker for the gene.
Getting back to Seattle Slew, he was EE (Black-Black) at at (Brown-Brown) and since at is the most recessive of the genes at the Agouti gene location, any time the mare contributed a dominant version of Agouti, the foal would be Bay. Meeting the recessive version of Agouti (a) would result in a black horse, and a (at) would produce a brown foal.
So while he was a true breeding black horse, he wasn't a true breeding bay.
Northern Dancer carried both the Red and the Black color coat genes, but most of his black based are bay. He's got a couple of foals registered as brown, and a few as Dark Bay/Brown, whatever color that is.
So he carried the dominant version of Agouti, and the least dominant version.
A true breeding Bay would be one that carries two copies of the dominant version of both the black base coat color, and two copies of the dominant version of Agouti.
Other than getting any given horse tested, the way to tell is that a true breeding bay could only produce bay foals.