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Fiddler · Mar 9, 2022 12:07 PM

i've been looking for a homozygous silver stallion Z/Z so in the search i mark "Must have" for both Zs but I don't get ANY Homozygous horses at all in the search, there's plenty of -/Z and Z/-
do they not exist?

thanks

Mensie · Mar 9, 2022 12:20 PM

Z/Z horses absolutely exist but as far as I know, there is no way to specifically search for homozygous genes, unfortunately. If you find a stallion that you like, you can always GMT silver for 1 GMT token a piece. There are also some Herd Helpers that are Hom silver. From the Herd Helper list: All Washed Up, Silver Pocket Watch, Storm Warning, True Breeding Silver Black, True Dark Silver Bay Dun, and Homozygous Silver. You can use the search horses function with one of these in the "tattoo name" box.

Here is the link to all listed Herd Helpers: https://www.huntandjump.com/herdhelpers.php

MasterStablesMS · Mar 9, 2022 12:47 PM

You can search for homozygous genes!
Go to the horse search page.
Go to the "pigment modifiers" tab.
Scroll down a bit to the silver gene.
There you'll see 2 drop down menus, one for "Z" and one for "-".
"Z" is the silver gene, "-" means regular (or no mutation).
Set the box of "-" to 'must not have. That way you will only see homozygous silver horses!

Fiddler, what you did is set 'must have' on both, meaning you'll get homozygous horses, as they need to have both a "Z" and a "-"(non mutation/non silver).

If you set the box of the "Z" to 'must not have', you'll see all horses that do not have any silver (Z) gene.

Hope this helped!
And you can always narrow down your search further with other parameters.

Let me know if you need more help :)

Edit: this is the search i pulled up with having "-" on the Silver allele set on 'must not have', resulting in all homozygous silver horses as none of them have the "-" (non mutation).
https://www.huntandjump.com/adv_search.php?runsearch=go&jump=0&22=2&128=0&129=0

Mensie · Mar 9, 2022 1:28 PM

Oh awesome @MasterStables! Thanks for that. I never thought to set the "-" to must not have. Duh! Lol.

OopsDotCom · Mar 9, 2022 2:06 PM

How hard would it be to either breed or gmt a silver black to be hom silver?

MackZ · Mar 9, 2022 4:30 PM

To consistently get Homozygous on any gene, including silver, you would have to breed a Homozygous stud to a Homozygous mare. You would still have a good chance with Homozygous to Heterozygous, but Homozygous to Homozygous is a guarantee.

To GMT, you would simply add and subtract genes to get what you want. It's just a matter of knowing what you want and making sure you have enough tokens. And, of course, the horse you GMT has to be gene tested and unbred. It's easiest if you use a foundation horse, but a lined horse can be used as well, as long as its parents have the right genes.

OopsDotCom · Mar 9, 2022 10:05 PM

Well, if Fiddler needs any silver blacks, I'd be happy to part with a couple. I hatched way too many.

MasterStablesMS · Mar 9, 2022 10:26 PM

@OopsDotCom this FAQ might help answer your question about how hard it is to breed for a homozygous silver: https://www.huntandjump.com/faq.php#877

It's about Punnett Squares, that gives you insights in the probability of getting het or hom horses (or in the FAQ the probability of ending up with a dead foal).
So if you breed a hetero Silver (Z-) with a hetero silver (Z-) you'll have a 25% chance on a homozygous silver foal (ZZ), a 25% chance on a foal that has no silver (--) and a 50% chance of having a het silver (Z- or -Z).
If you breed a homozygous silver (ZZ) to a heterozygous silver (Z-), you'll have a 50% chance of having a homozygous Silver foal (ZZ) and 50% chance of a heterozygous silver foal (Z-).

I hope this helped a bit!

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