|
|
Discussion on Homozygous Tobiano siring solids
|
| Author |
Message |
Member:
Gintx
|
Posted on Saturday, May 6, 2006 - 11:37 pm:
One of my stallions has been tested by UC Davis and Shelterwood. He tested homozygous for Tobiano. Early in his breeding, he sired a solid foal out of a quarter horse mare.
He is now 10 years old and just sired another solid out of another quarter horse mare. He's sired approximately 40 Tobianos and 5 Toveros. Many of his offspring are also homozygous. Now 2 solids. I'm very concerned about these solids cropping up. Why would this happen? Is it from the quarter horse genetics? I'm baffled. 
|
Member:
Eoeo
|
Posted on Sunday, May 7, 2006 - 12:59 am:
You are finding out the sad truth that UC of Davis and several other places are full of crap about their tests for homozygous stallions. The only one that was indisputable and 100% correct was one that was done at the University of Oregon, I believe, by a lady named Peggy something. She no longer does it I believe. People got upset with her when the results didn't come out in their favor. My friend raises Paints and stood a stallion named Spook's Trophy Boy. He sired the first documented homozygous filly. He sired over 700 foals, all colored. She has a Black and White who is homozygous and has raised numerous other ones. She knows her stuff about what is homozygous and what isn't. She just laughed at the results that people were getting from these tests and the explanations why a "homozygous" stallion could produce solid foals.
These tests are just a joke anymore. EO
|
Member:
Dres
|
Posted on Sunday, May 7, 2006 - 10:14 am:
solid is cute tho.. !! I have a question re the homo foals.. do both parents have to have the ''paint'' gene for the foal to be homo.. ?? I ask this , becus in Apps, both parents have to have the LP / App gene in order to have a homozygous foal..
On the first day God created horses, on the second day he painted them with spots..
|
Moderator:
DrO
|
Posted on Monday, May 8, 2006 - 7:53 am:
As LKR states, your horse is not homozygous. However it should be understood there is no 100% accurate test yet for this gene that I am aware of and UCal does not claim its analysis is. For an explanation of how the testing is done see, https://www.vgl.ucdavis.edu/service/horse/tobiano.html. To answer Ann's question yes, both must have at least one tobiano (TO/to or TO/TO) gene for the foal to be homozygous (TO/TO).
DrO
|
Member:
Boomer
|
Posted on Friday, Aug 18, 2006 - 1:56 pm:
ok, what is homozygous? I have just adopted a registered paint filly who is solid chestnut..
|
New Member:
Kbaxter
|
Posted on Friday, Aug 18, 2006 - 3:40 pm:
homozygous mean from both parents, heterozygous is from one parent...I do believe. I too have a registered paint breeding stock,who is nearly all solid chestnut. Her sire is dual registered QH/Paint and the Dam was registered paint.
|
Member:
Tuckern
|
Posted on Friday, Aug 18, 2006 - 6:16 pm:
Being homozygous also means that that parent will always pass that tobiano trait to it's offspring. So, a true homozygous paint will always produce a colored foal.
(Well, unless the parents also pass on a trait that covers up the the tobiano trait, like grey, the grey gene is always dominant). But that's a whole 'nuther topic. 
Nicole
|
Member:
Christel
|
Posted on Friday, Aug 18, 2006 - 10:45 pm:
I am under the impression homozygous is not 100%, although close, it is 99.9%. So there is a chance or two of still getting a solid- Ginger guess your stallion proved that.
I have been told it is hard to get a bay quarter mare to throw a paint and if she has any Doc Bar in her it is almost impossible. Has anyone else heard this?
I have a bay Doc Bar mare bred to a homozygous tobiano stallion, with my luck she will throw a solid.
Chris
|
Member:
Morg1
|
Posted on Saturday, Aug 19, 2006 - 10:14 am:
I had a dark bay mare give me a paint foal by a homozygous stallion, but he only had the minimum requirements. She didn't have any Doc Bar breeding though. Here is a picture.
|
Member:
Eoeo
|
Posted on Saturday, Aug 19, 2006 - 10:30 am:
The tests they are doing are erroneous. There are only a FEW true homozygous Paint horses. A TRUE HOMOZYGOUS horse will NEVER produce a SOLID offspring. Spooks Trophy Boy was a TRUE homozygous Paint Stallion. He had over 700 foals, out of all of those, there was only ONE that had just a large belly spot on one side and the other side was 50/50 sorrel and white. He was documented by Portland State, in fact, his daughter was the first documented homozygous horse many years ago. The tests run now are flawed and show homozygous to almost every Tom, Dick And Harry that comes along and people want to believe it. Their explanation why a homozygous produces a solid horse just cracks me up. They are full of poo poo. EO
|
|
|
