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I would theorize (from my genetic knowledge from dog breeding) that breeding 2, both with chimera, would give you more like 75 percent chance. It does say at the bottom of the color results (if you tested) that it's a 50/50 chance of inheritance. But you can flip a coin and get heads 10 times in a row. Genetics are like that

@Walywoohoo The 50/50 chance is for which of the two DNA strands will contribute to the foal, not passing on the chimera trait.

@Bayleaf I would be thrilled to collect data from other players as long as it includes all the needed info. I have currently been only breeding chimera to chimera, but I would like to start getting data on non chimera parents producing chimeras, and results for when one parent is and one isn't. I would also like info on chimeras made via merge, but I know there are a lot fewer of them. I was planning on starting a whole new spreadsheet this season anyway, so the timing is kind of perfect.

The info I would need is:
How many horses were bred total (broken down to studs and mares)
How many were chimera
How many were lined chimeras (any history of chimera in the line counts)
How many total foals
How many chimera foals.
I would also like links to chimera foals produced

Ok, so the way that this game works is that a chimeric horse has a 50% chance of passing on strand one, or a 50% chance of passing on strand two. Breeding a chimeric horse is difficult, and fairly rare, so most people don't have it as their goal. However breeding chimeric horses together does increase your chances of a chimeric foal. It is still rare, but just ever so slightly less rare (think like 0.01 to 0.02 for example, not real numbers lol)

I notice sometimes when a horse image is generating, it will say “testing for Chimerism” on a normal horse.

I wonder if that’s just flavor text or if it has any relationship to that individual horse’s chances of producing a chimeric offspring.

Ok, very interesting!
Obsidian I'll try to post my bred brindle's info. I didn't breed many yet, but it'll be a few numbers for your research ;)