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Grey and creme gene question!

This is a discussion on Grey and creme gene question! within the Horse Colors and Genetics forums, part of the Horse Breeds, Breeding, and Genetics category
  • Steel grey ottb
  • Cream gene on grey

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    10-26-2011, 09:36 AM
Green Broke
(Correct me if I am wrong) I believe it's one in every 4 grey horses develop melanomas.

I don't so much HATE grey horses, it's that if any of my mares were to breed, then I still have that huuuge chance of a grey. And I would really like to change it up! None of my friends can tell my mares apart (even though one is a rose grey, one is a dapple and one is a fleabit lol). And even during the summer, if you live in Oklahoma, your horse is NOT going to stay white:)
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    10-26-2011, 09:37 AM
Green Broke
Originally Posted by Beauseant    
melanomas??? Please explain....

My gray OTTB was almost black two years ago, and look at him now....wonder how long it'll take him to turn white....

Oops, double post:)
Your horse looks just like my mare a year after I got her! When I bought her, she was a daark steel grey color with no dapples. Now she is the middle of dark dapples with fleabites!
    10-26-2011, 09:48 AM
I have found that the grey gene works FAST on a patterned Appaloosa. On a charcteristic, but not patterened Appy, it doesn't seem to work as fast.
Here is my 4 year old grey Appy gelding, Boots. His breeder keeps calling him a few spot. As you can see, he is not.

    10-26-2011, 10:47 AM
Green Broke
Reiningfan- That's awesome!! I'm guessing he is wet in that picture?:P

When I wash off my older mare, she is grey and COVERED in pink spots. All scars, but it makes her look like a reverse leopard
    10-26-2011, 11:01 AM
Yes, he was wet. We were at a show and he was doing his "suck in my gut & tuck in my tail" thing until I got the right warmth. It's a bad cell phone picture, my screen got scratched, but it shows his blanket outline pretty well.
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    10-26-2011, 12:09 PM
Homozygous grey is more likely to develop melanomas than a heterozygous grey. I believe that heterozygous greys are also more likely to develop the "flea-bitten" look. Horses that are aa at agouti (as opposed to Aa or AA) are also more likely to develop melanomas. This was all discovered when they developed and came out with the test for grey. Notice, it says most/more likely, not absolute.
    10-26-2011, 01:58 PM
Ummm....what's the difference between heteryzgous or homoyzgous....and how can you tell which one your horse is?

Sorry if I sound stupid..
    10-26-2011, 02:04 PM
Homozygous greys, when bred, will only produce foals that will end up grey.
Heterozygous greys have a 50/50 shot at giving you a grey foal when bred.

The only way you can tell is if you get them color tested.
    10-26-2011, 02:45 PM
Thanks....i think I understand that.

Are grays doomed to get skin cancer then?? It's kind of freaking me out....

My gray boy's mother was a gray...and he is descended from the Tetrarch through her...ALSO, on his sire's side he is descended from Native Dancer, the gray ghost..... I always like his dappled gray coat, now I am wishing he WASN'T GRAY...NOT If melanoma is the price he has to pay
    10-26-2011, 04:31 PM
Not every gray gets melonoma. I don't know a whole lot about it though,sorry. You could PM Wallaby and ask her about it. Her mare Lacey has melanomas on the corners of her mouth.

And homozygous means a horse has two copies of a gene, meaning they will always pass on that gene. Heterozygous means they only have 1 copy, giving them a 50% chance of passing on thta gene. It's easier to explain wih the cream gene because you can look atthe horse and know it's zygosity. Palomino and buckskin are heterozygous for cream; they only carry one copy and have a 50/50 chance of throwing a cream dilute foal. Cremello and perlinos are homozygous for cream and will always pass on one copy of cream no matter what.
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