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PopcornFireworks · Jan 7, 2020 5:36 PM

I have a horse that is heterozygous for silver (Zz), and several horses who do not have any reference to silver at all in their test results. Are all those horses homozygous for not silver? (which I'm assuming is zz?). Do horses only display a gene in their genetic testing results when they have an "interesting" allele? If that's the case, why do other genes (like flaxen for example) show up in testing seemingly regardless of the alleles present?

Here's the horse with silver for reference

Rowan 10051332

kgstable · Jan 7, 2020 5:50 PM

Are you asking why some horses require two copies of a certain gene to show and some only require one? Or are you asking which genes don't show up in testing results?
Or are you asking why some genes (like flaxen) do or don't show in the color name?
I'd love to answer if I can but I want to make sure I understand your question correctly! :)

Alianne · Jan 7, 2020 6:05 PM

I think it's because if the line showed every gene possible, it would be way too long.

Also, things like E (eumelanin), A(agouti), C(cream/pearl), D(dun), G(gray), F(flaxen), S(sooty), and P(pangare) are consider baselines. If your stallion had the genes Ee( or eE, EE) instead of ee, the silver would show as it affects that gene. I.E. you can have silver blacks (EE, aa, ZZ), silver bays(EE, AA, ZZ), silver grullos(EE, aa, DD, ZZ), silver buckskins(EE, AA, CrC, ZZ) but not silver chestnuts.

https://www.huntandjump.com/geneticsguide/?page_id=27 ----This is a good page to read to help you understand a little.

ztcreek · Jan 7, 2020 6:25 PM

You are correct. Silver (Z) only shows up when they have a gene for it. If silver does not show in the genotype, they are zz (homozygous for no silver).

CravenHillEstate · Jan 7, 2020 6:37 PM

What @ztcreek said adding the fact that the horse you gave us a link to is a chestnut and chestnuts don't show silver. They're just carriers of the gene. :)

SandyCreekAcres · Jan 7, 2020 7:12 PM

At one time, several real-life years ago now, Ammit left every gene in the report of the genetic testing, whether they affected the appearance of the horse or not. Enough players were finding that confusing that she has abbreviated the report to mostly include only the genes that are affecting a given horse's color. The basic color genes are usually reported--Extension, Agouti, Cream, Dun, Gray, Flaxen, Sooty, Pangare, and Silver. Champagne, Satin, and the pattern genes are generally only reported if they are there to affect the horse's appearance.

Some genes, like DP and KP, for instance, are "hidden" and not ever reported.

PopcornFireworks · Jan 7, 2020 7:17 PM

Thanks all! This answered the question I was asking and several others I didn't know to ask :)

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