Dilution versus Modification - The Horse Forum
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post #1 of 14 Old 01-20-2013, 04:01 PM Thread Starter
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Dilution versus Modification

Ok, looking through one of my horse book, I found that brown was listed as a modification of a dark color, it then went on to list a bunch of dilutions (Perlino, cremello, dun, buckskin etc). But there was only one modification which was brown. What is the difference between a modification and a dilution?

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post #2 of 14 Old 01-20-2013, 04:53 PM
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A dilution is a separate gene which can act on the base colors (Black, Bay, Chestnut) so a chestnut with a cream gene is a palomino or a black horse with a dun gene is grullo. The dilution genes are cream, champagne, pearl, dun and a horse can have one or multiple dilution genes act on its base color so you can have a champagne dun with cream.

Brown (At) is a modified version of agouti gene which restricts black to the points. Bay horses agouti is Aa or AA depending on homozygous or heterozygous plus the have a red factor EE or Ee.
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post #3 of 14 Old 01-20-2013, 05:04 PM
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There are only two base coats... Red and black. Anything on those base coats is consider a modification of the base color.
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post #4 of 14 Old 01-20-2013, 05:10 PM
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There are only two base coats... Red and black. Anything on those base coats is consider a modification of the base color.
Oh you know I was thinking about that actually after I typed that I was like wait isn't bay a modification lol . I also forgot about recessive e/e and a/a.

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post #5 of 14 Old 01-20-2013, 05:30 PM
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Lol ee is red
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post #6 of 14 Old 01-20-2013, 05:41 PM
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Lol ee is red
lol darn it!

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post #7 of 14 Old 01-20-2013, 05:44 PM
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Any gene is really a modification of the base colors red and black because it's changing the color. The word dilution is used because these genes (ie: cream, champagne, dun, etc) because they dilute the base color. Chestnut becomes palomino with cream, black becomes grullo with dun, for example.
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post #8 of 14 Old 01-20-2013, 06:12 PM Thread Starter
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Thanks for clearing that up, none of my books explained it. Thank you.

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post #9 of 14 Old 01-20-2013, 07:04 PM
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The dilutions are cream, dun, champagne, pearl and silver. They are named because they dilute the coat colour (which seems really obvious, but just putting it out there lol). Modifiers are the ones that change the coat - agouti modifies the production of black in the coat, restricting it to the points. Other modifiers are grey, flaxen, pangare and sooty.

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post #10 of 14 Old 01-21-2013, 07:10 AM Thread Starter
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Is bay a base coat color or a modified coat color?

And is white/creme a base?

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