overo x tobiano.. - Page 3 - The Horse Forum

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post #21 of 30 Old 03-25-2013, 11:02 AM
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The four with minimal or no white (I think there was two that had no white, two that had minimal from memory, but mated minimal x no white) have produced two foals that have each tested homozygous. These are the two foals:




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post #22 of 30 Old 03-25-2013, 11:04 AM
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Originally Posted by Chiilaa View Post
The four with minimal or no white (I think there was two that had no white, two that had minimal from memory, but mated minimal x no white) have produced two foals that have each tested homozygous. These are the two foals:



Yes I've seen those foals and I'm aware that the foals are tested homozygous. I was not aware that the solid parents had tested homozygous.
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post #23 of 30 Old 03-25-2013, 11:10 AM
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Sorry, I think you misunderstood me then. I meant that since the foals had tested Hz, the parents must be at least heterozygous for SW1 (I know, stating the bleeding obvious, but a lot of search hits come here, so if I spell it out, maybe they will get it too )

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post #24 of 30 Old 03-25-2013, 11:14 AM
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Sorry, I think you misunderstood me then. I meant that since the foals had tested Hz, the parents must be at least heterozygous for SW1 (I know, stating the bleeding obvious, but a lot of search hits come here, so if I spell it out, maybe they will get it too )
Ah ok.

That's what I thought, but then Poseidon said you had solid horses that tested Homozygous so I was curious.


We're on the same page then!
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post #25 of 30 Old 03-25-2013, 11:42 AM
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My mistake. I confused them from their foals because they are mentioned often and remembered it as the minimally marked ones being homozygous. My mistake. Either way, my point was being that not all expressions follow a specific phenotype mold.
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post #26 of 30 Old 03-25-2013, 07:30 PM Thread Starter
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Spice appears grullo, but I would wonder if she would test positive for At, but be so dark that the rest of her body appears black. There are plenty of browns so dark that their only giveaway is a lighter muzzle.

And I believe that is one of only a handful of pictures I have of Abby looking like a friendly, approachable horse, to be honest. She's very..exasperated often. She would happily live without humans while bossing around her posse. She's not out with her actual friends (one of whom has moved anyway) anymore, but has accepted Kaja well enough as a buddy. She hates the geldings she lives with, even though one is hopelessly in love with her. Abby has a serious Abbytude, as seen here:



Any horse that's 'black based' could be possible At right? --since its a agouti mutation?

Haha! I love the 'abbytude' Why does it seem like the pretty colored ones are always the ones that seem to be more bossy?

Do horses treat each other differently by color?

I noticed in a group of many different colors-- blacks hang out with light greys. Sorrels with the bays. Palominos with the bucks and duns. There any reasoning behind it or just random yet coincidental? Lol.
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post #27 of 30 Old 03-26-2013, 12:24 AM
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Sort of. I'm about to go to bed, so I hope this makes sense. It makes sense in my head, but relaying it right now might be fuzzy. Any color that is strictly black + a modification other than agouti (champagne, cream, dun, silver, etc) cannot have agouti because that would cause a different color, which takes out a large number of black based horses.

While not entirely correct to say because bay is black-based, it would be easier to think of it as any bay-based horse could also be carrying At. A horse can be AAt, but it would still be a bay horse because A is dominant over At. And it is also easier to say that any red-based horse could be carrying At. At least with a black-based horse, we can make assumptions based on its phenotype on what agouti mutation it may carry, but red based horses have no black to restrict, leaving zero possibilities to determine agouti status without a DNA test.

Abby's best friend was a sorrel Appy with snowflakes along with their gray friend. She's buddied up with Kaja now, who is a dun. Coincidentally with your post, the gelding they live with is a palomino. Where I board my horses, there are 3-4 horses per paddock who are grouped based on gender and personality. We don't have much variety in color anyway, so there really aren't patterns.
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post #28 of 30 Old 03-26-2013, 01:53 AM Thread Starter
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That makes sense to me-- agouti is dominant over brown because brown is a mutation of agouti-- but agouti is really dominant over all colors it just needs the E to make it appear.

If brown is a mutation of bay is it a dilution-- since it makes the 'soft parts' of the body lighter?



Lol, I knew it!!. im joking-- I know your horses are a totally different situation-- but, my ol man did tell me that he thought horses colors affected their personalities.. He said he thought palomino horses were different because theyre smarter-- he's not very 'horsey' but maybe he sees something us 'more horsey' people don't see? I do tend to get along better with sorrel and black horses for some weird reason, lol.
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post #29 of 30 Old 03-26-2013, 02:10 AM
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Brown is not a dilution. Known dilutions are cream, dun, silver, champagne, and pearl.
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post #30 of 30 Old 03-26-2013, 05:11 PM
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That makes sense to me-- agouti is dominant over brown because brown is a mutation of agouti-- but agouti is really dominant over all colors it just needs the E to make it appear.

If brown is a mutation of bay is it a dilution-- since it makes the 'soft parts' of the body lighter?

No, it is not a dilution. It's a modification.

And bay is dominant over brown based on how it restricts black. In theory, A+ would be dominant over A, as it restricts black the most, then A dominant over At because it restricts black more than At, and At last because it restricts black the least. But note the "in theory" part. This seems perfectly logical, but then you have to take into account that if that were true, we would probably see more wild bays.
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