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Eye Color

Equine-Reproduction.com Bulletin Board » Equine Genetics » Eye Color « Previous Next »


Author Message
 

charlene birdsall, Baby due 4/2/08
Breeding Stock
Username: Charlie67

Post Number: 373
Registered: 06-2007
Posted on Thursday, January 31, 2008 - 04:47 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

What are my chances of getting a baby with blue eyes. My mare is a b/s paint. Her dad is a red dun overo, and the stallion I bred her to is a homozygous black and white Tobiano. Can my mare still carry the overo gene even though she is considered a breeding stock paint?
 

Colleen Beck
Breeding Stock
Username: Gypsycreations

Post Number: 319
Registered: 02-2007
Posted on Thursday, January 31, 2008 - 06:27 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I'm not sure, it's possible. The stallion could also carry an overo gene. If he has a white blaze, he probably has either overo, splash, or sabino. Overo and Splash can be responsible for blue eyes.
 

charlene birdsall, Baby due 4/2/08
Breeding Stock
Username: Charlie67

Post Number: 374
Registered: 06-2007
Posted on Thursday, January 31, 2008 - 11:14 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi Colleen. The daddy(A Tru Rolex)only has one overo way back in his lines, and he only has a little star. You can see what he looks like herehttp://www.geocities.com/atrurolex/. This is my mare[IMG]http://i198.photobucket.com/albums/aa97/mollytomale-photos/P1010032.jpg[/IMG]
 

Colleen Beck
Breeding Stock
Username: Gypsycreations

Post Number: 322
Registered: 02-2007
Posted on Friday, February 01, 2008 - 11:47 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

From looking at the stallion, I would say he carries an overo or splash gene and probably a sabino gene. See the jagged edges to his markings, probably caused by sabino. The mapping or halo around his markings are not present with just a pure tobiano. A true tobiano with no other white factor will have a completely solid head, so something else is causing the facial white. There are SEVERAL sabino genes that can be working together on a given individual, however, there are not tests available for all of them, so color genetics is still an inexact science. check this www.equinecolor.com
 

charlene birdsall, Baby due 4/2/08
Breeding Stock
Username: Charlie67

Post Number: 380
Registered: 06-2007
Posted on Friday, February 01, 2008 - 11:34 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I Colleen, you really think he carries an overo or splash gene, and a sabino. Do you have any pics of a true tobiano so I could compare? He only has a really small star, and snip. I have looked at that website before extensively. It's a really good website. So do you think my baby could have blue eyes? So can my mare carry the over gene even though she is a bs paint? This is what she looks like[IMG]http://i198.photobucket.com/albums/aa97/mollytomale-photos/PA280019.jpg[/IMG]. This is her daddy,[IMG]http://i198.photobucket.com/albums/aa97/mollytomale-photos/scan-1.jpg[/IMG]
 

Colleen Beck
Breeding Stock
Username: Gypsycreations

Post Number: 326
Registered: 02-2007
Posted on Saturday, February 02, 2008 - 12:42 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Charlene, Personally, I doubt that the baby will have blue eyes if neither parent has them. We had a colt last year out of a blue-eyed tobiano/splash/sabino mare and he has two brown eyes, like his sire. I'm not sure that a lot of study has been made into the eye color genetics. At least I haven't found much research, except that linking it to the splash and overo genes.

Hard to tell without testing, but your mare's sire looks like he could carry either the splash gene or the overo gene (or both). There has been some discussion as to which gene tends to create the "smile" spots. The wide blaze on your mare indicates some sort of a white pattern gene, but I couldn't tell which one by looking.
 

Tansy Brassfield
Yearling
Username: Spccutnoak

Post Number: 66
Registered: 08-2005
Posted on Saturday, February 02, 2008 - 02:12 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have a tobiano mare that is only tobiano according to her pedigree and she has two brown eyes and was bred to my palomino QH stud and they produced a tobiano with a partial blue and crazy markings. All of her other babys have been 50/50 marked tobiano's no blue eyes, only this one.
http://www.brassfieldranch.com/2005colt.htm
 

Colleen Beck
Breeding Stock
Username: Gypsycreations

Post Number: 328
Registered: 02-2007
Posted on Saturday, February 02, 2008 - 05:19 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Her pedigree will not reveal the dna make up. In the paint world, she will be called a tobiano or an overo...but there are a lot of other variables. Crazy markings almost always mean there is another white gene at work. The blue eyes definitely mean there is another gene at work.
 

charlene birdsall, Baby due 4/2/08
Breeding Stock
Username: Charlie67

Post Number: 385
Registered: 06-2007
Posted on Saturday, February 02, 2008 - 06:39 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Thanks Tansy for your inmput. Your horses are beautiful, by the way.

Colleen I just bought the book "equine color genetics". It's very interesting, but can get very "deep". I hoping it will give me the answers to my questions.
 

charlene birdsall, Baby due 4/2/08
Breeding Stock
Username: Charlie67

Post Number: 386
Registered: 06-2007
Posted on Saturday, February 02, 2008 - 06:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Colleen, what are "smile" spots? Here shortly I'm going to send in a mane sample to UC Davis to test for Red Factor and Agouti. Do they have a test for the splash or overo gene?
 

Colleen Beck
Breeding Stock
Username: Gypsycreations

Post Number: 332
Registered: 02-2007
Posted on Sunday, February 03, 2008 - 12:31 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Smile spots are the pigmented spots on the sides of their mouth. Makes em look like their smiling (-:

Yes, I believe they have tests for both.



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