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My new yearling. WHAT COLOR?!?!?!?

This is a discussion on My new yearling. WHAT COLOR?!?!?!? within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category

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        12-06-2011, 02:07 PM
      #41
    Foal
    Frame, splash and sabino are all genetic variations of Overo, not Tobiano.
         
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        12-06-2011, 09:42 PM
      #42
    Green Broke
    Quote:
    Originally Posted by paintsrule2    
    Frame, splash and sabino are all genetic variations of Overo
    I have to disagree with you here, because this is one of my pet hates. I HATE lumping splash, sabino and frame under the same name. They are NOT variations of the same gene at all. They are different genes, and we should not be lumping them under one name. Usually I wouldn't have a problem - but frame (as I am sure you know) is something that needs to be clearly identified, especially in breeding horses.

    Ok, rant over. Sorry about that.
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        12-07-2011, 10:02 AM
      #43
    Foal
    Not a problem at all, but if you look at the definitions that APHA provides, the genes are not linked to the Tobiano coloration, but to forms of Overo.
         
        12-07-2011, 10:46 AM
      #44
    Trained
    Breed registries are the last place I would look for correct color definitions.
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        12-07-2011, 10:53 AM
      #45
    Foal
    Overo is also becoming a fairly outdated term as well in genetic circles...used to you would hear splash white or splash white overo..now it's just splash (they've even dropped the white, most likely due to the finding of dominant white as to not confuse), frame overo is now frame, and sabino overo I haven't heard in ages, but is now just sabino. You rarely hear the word tovero in some circles as well, most people preferring to say what patterns exactly.
    Overo was just meant to mean--Not Tobiano.
         
        12-07-2011, 11:00 AM
      #46
    Foal
    How the Overo Genes Work
    Unfortunately, little is known about the genetics that create these patterns. It is commonly accepted that the overo patterns are under the influence of one or more dominant genes. It appears that each of the patterns may be the result of a dominant gene; but, it is also possible that there is just one gene with other gene modifiers that change the pattern.
    There is also some evidence that the genes which produce leg and facial markings may influence the amount of white on an overo. This appears to be true for the sabino and splash white patterns. The frame overo, like the tobiano, is thought to be less sensitive to these genes.
    Time and research will eventually answer these questions. For now, here is what the three overo patterns seem to have in common.
    All the overo patterns have a large range of expression. At one end of the spectrum they appear mostly white. At the other end, they may be hard to identify from solid horses.
    The frame overo has dark color running along the topline. The chest is usually dark as are the legs and the tail.
    The color pattern referred to as sabino encompasses a wide range of patterns. It is possible that more than one pattern has been included in this category; but, at the moment, we are going to assume that this is the varied expression of a single gene.
    This gene has been designated as the dominant "Sb" gene.
    The sabino horse characteristically looks like it ran through a vat of white paint while a paint sprayer splatter white creating speckled areas of the body. These roany body spots are usually located on the belly and have crisp jagged edges.
    Splashed white is the rarest of the overo color patterns. This pattern looks like a horse ran through a deep vat of white paint. According to Dr. Bowling's recent work, this overo pattern is under the control of a dominant gene identified by the letters "Spl".

    By the way: Dr. Ann Bowling, Executive Associate Director of the Veterinary Genetics Laboratory UC Davis, CA
         
        12-07-2011, 11:04 AM
      #47
    Foal
    What I find fun--tobiano, sabino and dominant white are all found at KIT (as is roan)...a wide variety to be found at the same location.
    Splash and frame are both found elsewhere...can't remember on frame at the moment, and last I heard, they were very close to pinpointing splash down.
         
        12-07-2011, 11:06 AM
      #48
    Foal
    Genetics are fun and confusing. New research is coming out every day. As stated in the excerpt above, Splash is the rarest of Overo patterns and controlled by a dominant gene "Spl". There is no guarantee that by breeding a splash to a splash, that you will get a splash...
         
        12-07-2011, 11:16 AM
      #49
    Foal
    I don't think splash is as rare as they think...I just think it can hide VERY well Like in the case of my friends horses...two normal looking AQHA horses that produced one heckuva loud splashed filly Only indicators they both have splash--sire has a blue chip in one eye and both have narrow stripes that veer off at the nostril every so lightly
         
        12-07-2011, 11:21 AM
      #50
    Foal
    The article only said that Splash was the rarest form of Overo, meaning that you are more likely to see a frame or sabino overo, not that the pattern was rare and illusive. I haven't yet found any other research by a reputable lab, that states much different. Since I am a Paint horse breeder, I do look for this research and try to stay up to date.
         

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