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White Thoroughbred Q

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White Thoroughbred Q

#94045 Posted on 2017-02-19 09:40:40

I bred my mare to a stud who is White, does that mean he has the gene as a carrier or that he doesn't have it at all because he is plain black.


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#94050 Posted on 2017-02-19 10:27:39

I'm assuming we're talking about Barbaric Satisfaction.

Since the foal is black, that means the stud who was white has Ww genes. White is dominant so if the foal is black he does not have the white gene at all.

Your horse does however have the G gene, which means he will eventually turn gray. :)


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#94084 Posted on 2017-02-19 12:41:58

Thanks so much :)
I was hoping he was a carry at the least but maybe next time.


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#94129 Posted on 2017-02-19 15:07:07

White is sort of an all or nothing gene. They can only carry one copy (W) cause WW is considered lethal. And on here it goes with either a +, Sb, or Rn I believe. So they essentially can pass on white, nothing, or a pattern, but the foal can't ever be just a carrier. So if you breed to a white horse, you have a 50/50 shot of getting either a white foal, or no white in the genetics :)


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#94136 Posted on 2017-02-19 15:46:27

What do you mean by lethal?


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#94137 Posted on 2017-02-19 15:47:54

^ In real life, WW causes some defect (I forgot what exactly) that makes living impossible (so the horses have to be put down). Someone else can probably answer this better lol

Last edited on 2017-02-19 at 15:48:22 by Raptorfang Ω


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#94154 Posted on 2017-02-19 17:01:07

I think in the genetics guide, Abbey wrote that WW causes the intestines to form incompletely, so the foal can't survive more than a couple of days :/ Abbey made it so that there's no such thing as a WW foal in the game, so if you breed two Ww horses, you can get Ww or ww (each parent passes one copy to the foal). Even if the Ww horse has a pattern, such as WSb or WRb, it will show as solid white with "No Pattern" (if I recall correctly).

In real life, a W gene can cause different types of white spotting and markings or a solid white horse.

Last edited on 2017-02-19 at 17:01:36 by Ðemure


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#94229 Posted on 2017-02-19 23:12:39

@Raptorfang, that is actually incorrect, if we're speaking in realistic terms. There have been homozygous W horses. It just depends on the mutation. There are currently 22 different W mutations in horses in real life. It's only been confirmed to be lethal in only one (found in the endangered Camarillo white horse). It is theorized to be embryonic lethal in some other mutations, but this has not been confirmed.

The only white pattern that causes incomplete digestive system and death is frame overo. The Camarillo White mutation is embryonic lethal, so the foals don't even hit the ground; they're just reabsorbed or aborted.


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#94232 Posted on 2017-02-19 23:55:34

O.o interesting. I thought I had gotten the intestinal bit from the genetic guide, but it's not there now (either under dominant white OR overo).... maybe it was updated?

Last edited on 2017-02-19 at 23:56:00 by Ðemure


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#94241 Posted on 2017-02-20 05:20:34

^ I feel like I read that somewhere as well, but also the overo bit. Interesting!


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#94473 Posted on 2017-02-21 13:35:52

I honestly think that the reason we don't see many horses that are homozygous for one white spotting mutation is that most of them run in a particular family line, so in order to get a homozygous horse you would need to at least do linebreeding, if not straight up inbreeding. The only real exception is W20, which is found in many lines and breeds and simply acts as a booster to other white patterns.

The "homozygous white spotting is lethal" thing is probably in the same vein as "homozygous roan is lethal" thing. There are probably multiple mutations of roan and at least one seems to be homozygous lethal in specific breeds (I believe some heavier breeds from the UK?) if the marker test is anything to go by.


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#94588 Posted on 2017-02-22 02:56:36

Breeding an overo horse to another overo horse will produce a foal with what is called lethal white. These foals look to be all white with only a spot or two of color. When the foals are born they look and act normal. With in a few days though they nurse and feed as normal they do not produce fecal matter. The intestines and or stomuch in these horses are not complete. Most times they only live a few days. Some times the mare will kill the foal her self. other wise they are either put down or die with in a few days of birth. Hope this post helps


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