What is lethal white?
 
 

       The Horse Forum > Horse Breeds, Breeding, and Genetics > Horse Colors and Genetics

What is lethal white?

This is a discussion on What is lethal white? within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • Lethal white carriers
  • What does lethal colt mean?

Like Tree5Likes

 
LinkBack Thread Tools
    09-19-2011, 07:21 AM
  #1
Foal
Question What is lethal white?

My friend has a lovely paint colt who she intends to breed with her mares when he is older. But I'm wondering....

Apparently his sire tested as having no lethal white gene or somesuch but he (the now colt/soon stallion) has not been tested himself yet. She decided not to have him gelded on sire's pedigree.

What is it (how does it manifest in offspring) and is it something that should be known before she breeds from him? I mean is it lethal? Does it affect quality of life of horses who have this gene?

Any replies appreciated.
     
Sponsored Links
Advertisement
 
    09-19-2011, 08:41 AM
  #2
Trained
Lethal white (or frame overo or OLWS) is for all intents are purposes what is it named. A horse can have one copy of the OLWS gene and be fine (heterozygous for frame). A horse only is lethal if is carriers two copies (homozygous for frame)

You have to have horses with one copy in order to get horses that look like this -



The problem is, when you breed two OLWS carriers together you have a 25% chance of producing a lethal (or homozygous for rame overo) foal. The foal will not survive past 72 hours and if not humanely euthinzed, it will die a horribly, horribly painful death.

Horse can carrier the frame overo/OLWS gene and be completely solid. It is a good idea to test any horse of QH or APHA breeding to be sure of the frame overo/OLWS status before breeding.

This is a great website with lots of facts about OLWS. OLWS


I am not even going o go there with the foolish reasoning of breeding off the sire's pedigree alone... All I can say is I hope that your friend does her research and unless the colt is absolutely spectacular, that she gelds him. There are more than enough average stallions out there without adding more.
     
    09-19-2011, 06:49 PM
  #3
Banned
Yes, it's lethal--hence the name lethal white. And even with a "clear" sire, he should still be tested, as he can still be a carrier. Either he or the mare MUST be tested and negative if you don't want to risk the heartbreak. Breed two carriers, and you've got a 25% chance of a suffering and dying foal.
     
    09-20-2011, 10:24 PM
  #4
Foal
Lethal White Overo: What you should know | Color Genetics
     
    09-20-2011, 10:29 PM
  #5
Trained
Breeders of the desireable Overo Paints live with the lethal white factor. Foal is born, lives for a day, then dies. Nothing can be done to save it. I have witnessed one lethal white. Was told by the farm owner it was the price she pays for the more desireable overos. That was a while ago, I don't know if things have changed, pretty sure the lethal white foals still die.
     
    09-20-2011, 10:49 PM
  #6
Trained
Waresbear, they don't have to be dying anymore. I have overos and I know who carries the OLWS gene and those horses never get bred to each other. It's only when both parents are carriers and both throw the gene that the foal dies, obviously neither parent is homozygous for it or they'd both be dead too. I breed the OLWS horses to either a tobiano or to a clear solid breedstock horse. If only one horse is carrying the gene, only one can pass it on and the foal will not die, at worst it will be a carrier.

I bought this young lady (an OLWS carrier)


To be bred to this colt (a sabino who tests clear)as soon as both are old enough:


There's no way a foal of theirs will die and I have at least a 50/50 chance of color with this mating. Even if the foal ends up breedstock, it'll be a very good looking and athletic horse. There doesn't have to be a deadly downside anymore if you're careful in the matings.
     
    09-20-2011, 11:02 PM
  #7
Trained
This breeder had a stallion who carried the lethal white gene (I own him now, he's a gelding), he's sired some expensive babies (one for sold for $60,000) and she bred him to outside mares but she also bred him to her own mares. After the lethal white, I asked her why she was breeding the same mare back to him. She said all better bred overos carry the lethal white gene, her next foal from the same mare was a solid. By the way, the mare that had the lethal white was solid as well. She told me no tobianos carry that gene, only solids & overos. I don't know, just what I was told by someone who paid me to ride & show their horses, I wasn't going to argue.
     
    09-20-2011, 11:02 PM
  #8
Banned
To clarify, though, even solids and tobianos can be LW carriers, and thus must be tested negative before being bred to another carrier. You breed two carriers together, regardless of their base color or apparent pattern, and you've got one if four odds of a lethal foal....and it's true that no vet can save them. They colic and die or you euthanize them. The gastrointestinal tracts is malformed and incomplete, as the same gene that controls the color also has a role in GI development.

And RESPONSIBLE breeders know how to get the overo color without risking dead babies.
waresbear likes this.
     
    09-20-2011, 11:31 PM
  #9
Trained
"And RESPONSIBLE breeders know how to get the overo color without risking dead babies."

That's just it, responsible breeders test their stock. I even test my Arabians who carry the Sabino gene as that's an overo trait. I've not had a purebred Arabian test positive for the OLWS gene but if I have the negative results then I don't have to worry about crossing my half arab who does carry the OLWS gene on that particular horse.
     
    09-20-2011, 11:44 PM
  #10
Weanling
What about it kills foals?
     

Quick Reply
Please help keep the Horse Forum enjoyable by reporting rude posts.
Message:
Options

Register Now

In order to be able to post messages on the The Horse Forum forums, you must first register.

Already have a Horse Forum account?
Members are allowed only one account per person at the Horse Forum, so if you've made an account here in the past you'll need to continue using that account. Please do not create a new account or you may lose access to the Horse Forum. If you need help recovering your existing account, please Contact Us. We'll be glad to help!

New to the Horse Forum?
Please choose a username you will be satisfied with using for the duration of your membership at the Horse Forum. We do not change members' usernames upon request because that would make it difficult for everyone to keep track of who is who on the forum. For that reason, please do not incorporate your horse's name into your username so that you are not stuck with a username related to a horse you may no longer have some day, or use any other username you may no longer identify with or care for in the future.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Old Thread Warning
This thread is more than 90 days old. When a thread is this old, it is often better to start a new thread rather than post to it. However, If you feel you have something of value to add to this particular thread, you can do so by checking the box below before submitting your post.

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
would this breeding cause a lethal white?? sumatimgrl Horse Breeding 15 03-17-2011 08:29 AM
A white horse isn't truely white unless it's brown drafts4ever Horse Pictures 29 01-06-2011 08:08 AM
Is Tylenol (acetaminaphen) lethal for horses? brandilion Horse Health 8 12-16-2010 11:42 AM
Is Lethal White Syndrome the same as albino? Jessabel Horse Breeding 16 05-09-2009 10:15 PM
LETHAL WHITE FOAL SYNDROME - INFORMATION sparky Horse Health 4 01-11-2007 11:25 PM



All times are GMT -4. The time now is 09:33 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0