Is there such a thing as Homozygous solid? - Page 2

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Is there such a thing as Homozygous solid?

This is a discussion on Is there such a thing as Homozygous solid? within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category

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    02-07-2012, 10:31 PM
Here is an example of a homozygouse solid horse. Does not matter what you cross her with she is still homozygouse solid.

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    02-07-2012, 10:48 PM
Has she been tested to prove it NRHA??? *whistles*
    02-07-2012, 10:52 PM
Yep she is EEAA and has no other color genes going on. She does not even have any white markings. Few white hairs on her head and that is it but no white under the hairs. Same as her dam.
    02-07-2012, 10:57 PM

Until there is a test for all types of Rabicano, Sabino, Dominant White, and Splashed White, then we can't assume that a "solid" horse is not carrying a white pattern. We already know that frame and tobiano can be present in a horse with no white at all. There is nothing so far to suggest that the other white patterns can't be so minimally expressed as to not express at all.
    02-07-2012, 11:00 PM
Green Broke
Originally Posted by trainerunlimited    
I don't see how a horse can be homozygous solid, because if you breed it to a paint, you have a 50/50 chance of paint. I've never heard of a horse who wouldn't throw a paint when bred to one. If you breed a solid to a homozygous paint, you'll have a paint, right? Please correct me if i'm wrong.
This is actually what brought up the question. Cinny's dam is a solid sorrel with no white markings at all. Her owner has been breeding her to paints swearing that she will one day throw a paint. 10 foals later, no color. Cinny is the first in a long line of solid paints from this mare.

I don't know if she has ever genetically tested the mare as I'm not close enough to the person to ask, we are mere acquaintances, mainly because I 1) bought a horse from her and 2) we participate in a lot of the same clinics. I've seen all the offspring in person back when I got Cin, and the ones who have been born since, on her Facebook... and she always seems disappointed when the foal is born....solid. Some of the more recent studs were guaranteed color producers too.
    02-07-2012, 11:05 PM
Case example - look at Friesians. They are fairly pure bred as a breed. They don't allow outcrosses at all. Occaisionally, you get one that is chestnut (they call it fox) or you get one that has a star, or a small white spot on a heel somewhere. This is what leads us to believe that there are white suppression genes in horses. The white genes are there, they just don't express phenotypically.
    02-07-2012, 11:20 PM
The mare I posted has no white nor dose her dam. They are solid bays. Her sire is a solid bay no white at all either.

She has been tested for frame sabino and tobie as it was part of the test. Even though there is no way she can be Tobie being a full QH. This mare is about as homozygous solid as you are going to find.
    02-07-2012, 11:28 PM
I am picking up what you are putting down NRHA

All I am saying, is that until we have a test for every single white pattern, we can't definitively say that a horse does not have any white patterns at all. There are a few breeds where white is not allowed and yet still occurs, and other breeds where white is not as desirable as solid (such as QHs), and yet crop-outs occur in them too. The white is there, but the supression genes are there too. One of them has to win - in breed where white is desirable, white suppression is not as common.
    02-07-2012, 11:40 PM
I too get what you are saying. However look at her padigree. On her dams side there is no white on any of the horses. Her dam is a g-daughter of Poco Bueno who has no white. Bottom side of her dam is the same way. Her sire is by Docs Hickory who has only a very small white star. Now there is Doc Bar who has more white but past that there is very little with in 3 generations.

I agree that with the lack of testing it is hard to say but with the exception of splash she has been tested for every other pattern that has a test and is neg for all.
    02-07-2012, 11:56 PM
Interesting thread.
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