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Foxwood · Jul 1, 2024 11:52 AM

I'm looking for some advice/opinions on GMTing a Chimerism stud. I am a returning player and looking to start my foundation line again from scratch. I mostly breed for White M, KP, and DP. I have a Liver Chestnut Chimerism stud obviously with DP and hoping to add white M and KP. I initially chose this stud because he has the right genes and I really like the "brindle" look. However, I am now wondering if in my quest to get some more "brindle" horses I might be sacrificing my white M and KP line. I don't have enough GMTs/hbs to GMT both genetic sets so I would be decreasing the likelihood of offspring inheriting White M and KP by 50%. The trade off is that I would have about a 1/1000 chance of getting a brindle foal. I'm not sure if this trade off is worth it and given the GMTs/hbs I will be putting into this, I am hoping to sell some straws as well. The alternative is GMTing a plain Liver Chestnut stud. Any advice or opinions are greatly appreciated! Stud in questions is linked below.

FW Dark Milk Chocolate

HighstormFarm · Jul 1, 2024 2:23 PM

I have a few brindle stallions and have only gotten a few brindle foals, even when crossing with brindle mares. I believe using straw/eggs increases your chances a bit. I got 2 brindle foals last season creating embryos.

If your goal is color I would use a non chimeric and just keep that boy as a fun side project.

Poppidoll · Jul 1, 2024 2:44 PM

You can change the inheritance chance of each gene string in the GMT lab, if that helps.

Ellesmere022 · Jul 1, 2024 3:19 PM

I like to use chimeras for fancy foundations for that chimera foal chance. I usually get 2 or 3 chimera foals per season.

Whenever I am gmt ing a chimera, always edit strand one, then change the inheritance chance.
You are much better off only editing strand one rather than strand 2 because if, further down the line you get into premium, then cloning will only clone strand one of the horse.

This guy is a good example of helping produce chimeras. He is my best producer but I get a few more each season from various eggs too.

G1WD A Dream Of Hope FTS

Foxwood · Jul 1, 2024 6:25 PM

Thank you all for the guidance! I decided to GMT a different stud to start my KP, Kit M, and DP lines and keep my brindle stud in hopes of getting a few brindles babies. Here is my (probably) finished stud! Simple, but includes all the genes I want for my 2G horses! Thanks again for the advice!

FW Lamb Chop

Duven · Jul 2, 2024 7:30 PM

Great question and information. I have a chimera stud idea floating around. It's good to know you can change the chance of inheritance.

Haltanny · Jul 5, 2024 7:46 PM

A little note on the brindle look:
There is a more consistent way to produce a brindle like appearance. Dun Factor Promoter 1 gives a slightly brindled look, it's even part of the color name. It's not as sharply contrasted as a chimera, but it's there. If you combine it with the DFP2 gene, it gets even better. I've linked below searches of my own horses so you can see.

Here's all my DFP1 brindles
And here's all my DFP1/DFP2 brindles

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