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Homozygose determination (new member)

Equine-Reproduction.com Bulletin Board » Equine Genetics » Homozygose determination (new member) « Previous Next »


Author Message
 

Susana Massarani
Neonate
Username: Susanamassarani

Post Number: 1
Registered: 07-2005
Posted on Friday, July 15, 2005 - 11:25 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Dear Friends, I am new hear in the forum altough I always receive your threads. I am a geneticist in Rio de Janeiro Brazil and horse breeder.
I would like to know if someone knows how we can determinate by assays the homozygoses of the mottles (I donīt know if it is the correct word, sorry). Here in Brazil we do not have any labs that do this kind of test and I would like to start this here.

Thanks a lot!

Hugs,
Susana Massarani.
 

Cathy
Weanling
Username: Cathy

Post Number: 34
Registered: 04-2005
Posted on Friday, July 15, 2005 - 11:57 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hello Susana. I am sorry but I am not familiar with that term. If you could describe what it means we may be able to help. Sorry
 

Susana Massarani
Neonate
Username: Susanamassarani

Post Number: 2
Registered: 07-2005
Posted on Saturday, July 16, 2005 - 04:15 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi Cathy, I mean when the horse coat has white patterns, like pinto, paint...
For example, the horse is black and white with many white spots, big or not.
Thanks a lot,
Susana.
 

Cathy
Weanling
Username: Cathy

Post Number: 35
Registered: 04-2005
Posted on Saturday, July 16, 2005 - 11:00 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Susana you can request the test be done at any of the labs here in the US. All you have to do is send mane or tail hair.
If you mean setting up the testing to be done at a lab in Brazil you may want to start by talking to one of the labs here that could explain what is involved.
 

Sandy D
Yearling
Username: Sbr_appaloosas

Post Number: 80
Registered: 04-2005
Posted on Sunday, July 17, 2005 - 12:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Susana,
When you used the term "mottles" I know that term is sometimes referred to when describing an Appaloosa horse. Some geneticists refer to a solid, non coat pattern Appaloosa as just being mottled.
There currently is not a test available to determine homozygosity in an Appaloosa, although there are some folks who are currently working on finding a way to test for it. So far it has been determined that the few spot leopard and the snow cap Appaloosa coat pattern are indeed homozygous and will produce either coat pattern or mottled 100% of the time. With mottled meaning carrying the other three characteristics of the Appaloosa ie: visible sclera around the eye, mottled skin (usually on the genitals and/or muzzle), and striped hooves (with or without the presence of any leg white).
 

Susana Massarani
Neonate
Username: Susanamassarani

Post Number: 3
Registered: 07-2005
Posted on Friday, July 29, 2005 - 10:37 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Dear Cathy and Sandy, thanks for your attention!
The test I am reffering is not for appaloosa, is for any horse the has no solid coat. Here in Brazil we do not have such type of test and I was requested to do it.

I would like to contact the labs in USA, but I donīt know if they are allowed to give this information.

Thanks again and hugs,
Susana.
 

Debbie Burnett
Yearling
Username: Horselady

Post Number: 96
Registered: 03-2005
Posted on Monday, August 01, 2005 - 01:13 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Susana:

UC Davis at California has a website with all kinds of information regarding homozygousity and coat patterns. You can read this on their website if you type in http://www.vgl.ucdavis.edu/~lvmillon/ or go to Google Search engine and type in UC Davis equine genetics and the page will come up. It should answer many of your questions and give you other links to other sites that will help as well.

Deb
 

Donna Bass
Neonate
Username: Dbass

Post Number: 1
Registered: 09-2005
Posted on Sunday, September 18, 2005 - 03:49 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I have just purchased a tabiona mare that is due to foal any day now.I know she was bred to the same palomino stud back to back & her 1st foal was a paint.I want to know the chances of her having another paint foal. My mare has Tabiono back ground on her registration papers.How can I tell if she is a TRUE Tabiono?
 

Renee
Weanling
Username: Reneec

Post Number: 44
Registered: 07-2005
Posted on Sunday, September 18, 2005 - 08:30 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Donna,
The only way to tell if your mare is homozygous for tobiano is to have her tested. If she doesnt have two tobiano parents, then she is not homozygous, but if she does, then there is a good chance that she is, which means 100% tobiano foals. You can have this test done at UC Davis uni.
If she is not homozygous, then she has a 50% chance of throwing a tobiano foal, unless she carries some other paint pattern. The more patterns (ie- tobiano, overo, splash & sabino) she carries, the higher her chances are of throwing colour.
Goodluck, and i hope you get that tobby foal!! :-)
 

Cathy
Weanling
Username: Cathy

Post Number: 42
Registered: 04-2005
Posted on Monday, September 19, 2005 - 01:21 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

You can have her tested here for 1/2 the cost of UCDavis. http://www.petdnaservicesaz.com/Equine.html
 

anne*marie (Unregistered Guest)
Unregistered guest
Posted From: 68.1.36.213
Posted on Wednesday, February 22, 2006 - 06:23 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

So, Do I have this right? If the stud is tested homozygos tobiano then even if the mare is an almost solid (she happens to be a mottled w/few few flakes), will I get a tobiano baby? I would really like a tobiano baby...
 

Jenn
Breeding Stock
Username: Jenn

Post Number: 112
Registered: 01-2006
Posted on Wednesday, February 22, 2006 - 12:46 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Yes. If your mare was bred to a stud who is homozygous for tobiano the resulting foal will have tobiano markings.
 

melissa
Yearling
Username: Mbgirl

Post Number: 97
Registered: 01-2006
Posted on Wednesday, February 22, 2006 - 02:21 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I agree with Jenn. My mare Annie was breed to a homozygous stud last year had a tobiano foal. I was told that no matter what they are breed to if they are homozygous for the tobiano gene the foal will be tobiano. You can see my tobiano foal
www.photobucket.com/albums/e329/MBhorses
his barn name is Little Man. The vet thinks he might be homozygous has well. He has a few spots. I name him eye catcher on the paper work, because one side of his mane has a white I on it. He is almost 11 mos now, you can't see the I side, because the mane falls on that side.I have try to train it to the other side no luck.HOPE YOU GET YOUR TOBIANO FOAL. I wish I could breed to another homozygous stud,so I know I will get a paint.Homozygous stud are hard to come by.The only one I know of is 3 hours away.
TAKE CARE,
MELISSA
 

melissa
Yearling
Username: Mbgirl

Post Number: 98
Registered: 01-2006
Posted on Wednesday, February 22, 2006 - 02:22 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hello,
I forgot to tell you some stud are homozygous and have not been tested yet.
TAKE CARE,
MELISSA
 

Sara B
Neonate
Username: Countercanter

Post Number: 3
Registered: 02-2006
Posted on Friday, February 24, 2006 - 01:32 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Just so you know, breeding to a homozygous tobiano stud will not guarantee white on the body. Tobiano can be as minimal as four white socks! You are guaranteed that the resulting foal will test as tobiano and be able to pass tobiano on to its future offspring, but there is no guarantee that the spots will be placed in such a way that the horse can be considered a "pinto".
 

Jenn
Breeding Stock
Username: Jenn

Post Number: 124
Registered: 01-2006
Posted on Friday, February 24, 2006 - 05:50 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

There is no guarantee on anything when it comes to nature (horses in particular), it is all odds. The odds of having a tobiano that minimally expressed is very low.



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