Anyone understand Horse Color Genetics?

[Hime]

@tanner: Two bays can also make a chestenut foal, if the both parents are Ee. I get to our arabian topic bit later, but those are really good splashs.

@Toppy: I try explaining... Genes usually work in pairs, one pair has certain spot in the gene'line'. This is called place is called locus. In the locus the are two allels, which tells us what color the horse is in this case. There are 8(not sure, just counted quickly) known locuses responsible of coat color, not counting the one making patterns. Still with me? Moving to examples: When they talk about homozygous horse they mean it has two same allels in the same locus, example a chestnuts genetic profile (ee) is always homozygous since in the E-locus, or extension, it has two 'e'-allels. Homozyous bay/black would be (EE). Foal ALWAYS inherits half of it's genes from one parent and half from the other. That way, let say a bay mare with genetic profile of (EE AA) will always give you bay base colored foals. Double creams(cremello etc.) are also homozygous for cream, hence the name double cream. They will always pass on the cream color to their foals. Same thing with any other dilution, though they don't usually show that they are homozygous. That is why color breeders like to have homozygous diluted horses, they pass on the color 100% when a hetorozygous only passes it on with 50% chance. And since colors don't like to play with the odds, there's a chance that 3 out of 10 foals end up being diluted instead of 5 out of 10.

[Hime]

@tanner: Crossed my mind: If the gene most likely responsible of sabino like pattern on TBs is a dominant white, why couldn't it be the same for arabians? At least in some cases, some might truely be sabino/splash. These two seem to work bit similary, like when small the DW is blaze, white under face, stockings and some belly white. Which is pretty much the same with sabino. When sabino goes wild, the horse turns nearly completely white, same with DW.

[tanner]

@tanner: Crossed my mind: If the gene most likely responsible of sabino like pattern on TBs is a dominant white, why couldn't it be the same for arabians? At least in some cases, some might truely be sabino/splash. These two seem to work bit similary, like when small the DW is blaze, white under face, stockings and some belly white. Which is pretty much the same with sabino. When sabino goes wild, the horse turns nearly completely white, same with DW.

I think only select lines of TB's have DW, but true, most of them are mistaken and called sabinos. Like for example, Sato, of blazing colours farm, is called 'sabino' but I *think I read somewhere that he's actually tested positive for dominant white. I DON'T know about what other genes he has/has not been tested for. For you people from horse forum reading this. Notice he has a few max white foals on the ground.
http://equinetapestry.com/2011/07/28/sato/
http://www.blazingcoloursfarm.com/Sato.html

Dominant white, splash and sabino are present in TB's and Arabians, I don't know if there's any connection to the two way far back.

[Hime]

@tanner: Crossed my mind: If the gene most likely responsible of sabino like pattern on TBs is a dominant white, why couldn't it be the same for arabians? At least in some cases, some might truely be sabino/splash. These two seem to work bit similary, like when small the DW is blaze, white under face, stockings and some belly white. Which is pretty much the same with sabino. When sabino goes wild, the horse turns nearly completely white, same with DW.

I think only select lines of TB's have DW, but true, most of them are mistaken and called sabinos. Like for example, Sato, of blazing colours farm, is called 'sabino' but I *think I read somewhere that he's actually tested positive for dominant white. I DON'T know about what other genes he has/has not been tested for. For you people from horse forum reading this. Notice he has a few max white foals on the ground.
http://equinetapestry.com/2011/07/28/sato/
http://www.blazingcoloursfarm.com/Sato.html

Dominant white, splash and sabino are present in TB's and Arabians, I don't know if there's any connection to the two way far back.

I find it interesting that horses like Sato can have more wildly marked foals, even with solid horses. Two more Puchilingui line near white foals out of small marked mares.
http://www.truecoloursfarm.com/news/?p=607
http://www.truecoloursfarm.com/news/?p=599

Still the similarities with the two breeds sabinos makes me wonder. Like arabians and TBs are related waaaaayyyy back. So could it be possible that they have the same gene that causes the sabino like markings, which would actually be DW in some TBs case. I know this is pretty far fetched idea, but the way dominant white seems to work I don't see why some of the sabino arabians couldn't be dominant white. I don't know if any arab owners have tested their sabino like horses for DW...

[Sparky'sJolty]

I don't know tons about it, but I understand some bits. Chesnut leopard appies are the best!

Doesn't grey foal = chesnut/grey mother?

[Hime]

I don't know tons about it, but I understand some bits. Chesnut leopard appies are the best!

Doesn't grey foal = chesnut/grey mother?

Yes and no. Grey foal just means either of the parents must be grey, the base color of the parents doesn't matter how the grey passes on.

[tanner]

I heard (or actually read :P) talk about how the or some of the Khemosabi line may actually be dominant white? I'm sure there are so many strains of DW and splash that there may not be a test out for the type this strain of horses carry. I'm also positive that most Arabian breeders didn't think to test their more flashy horses for all or most of the available types of DW and/or splash either.

[moonlily]

Please don't post just to create/add to drama. If anyone does so, please do not respond to them. Just report them please.

[Hime]

I heard (or actually read ) talk about how the or some of the Khemosabi line may actually be dominant white? I'm sure there are so many strains of DW and splash that there may not be a test out for the type this strain of horses carry. I'm also positive that most Arabian breeders didn't think to test their more flashy horses for all or most of the available types of DW and/or splash either.

That's a possibility, though I haven't heard about it(not suprising as I only hang this forum and one other forum). It would fit that at least some, and not necessary Khemosabi line only, are dominant white, but some would really be sabinos. Which is the case with TBs.
True that, why test something for what it really is when it looks like sabino you know the horse passes it on? And since there's only one sabino test and it gives lot of negatives for horses that look like sabino. XD Unless you really really want to find out what it actually is, and have money to spend on the tests(also it helps to live in USA). Though as you said there's probably many genes responsible for patterns that haven't been found yet. Meaning even if someone tested their weirdly patterned horse for every white causing gene found, the results could still come out empty.

[tanner]

Few arabian breeders refuse to think of white patterns on arabs, and won't test their horses for anything. This is another thing I read on a gentics forum talking about the Khemosabi line.