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Yep, you can see he has two sets of genes. That is chimerism and it has a 50% chance of passing to his foals.

Thanks CLynnRose. I misunderstood but that makes a bit more sense to me.

@kennahill1989 It says that under each set of DNA because each set has a 50/50 chance of being selected to pass genes on to the foal. Within that chosen set, each allele also has a 50/50 chance of passing on, just like any horse. :)

The chance of it passing on when both parents are chimeric is still extremely small. A chimera is formed when two foals are started at breeding and merge within the dam's womb. Since twins are very rare in horses, and even more unlikely to develop correctly, a chimera is accidental and not genetically determined.

Nightphoenix recently posted this explanation of twins in horses that may help you understand more about why twin foals are seldom born.
https://www.huntandjump.com/forum/discussion/49924/the-danger-of-twin-foals#Item_12

Thank you all for the info! I'm kinda bummed that I can't breed for it, it sounds like it is just a random roll of the dice?

@OfMoosehorn, multiple people across the servers breed for it, but I see it as an very unsatisfactory way of breeding myself, as it's a huge roll of the dice to get chimeras, more disappointments during the breeding season than normal. If you wish to try, you do get a bigger chance with a full herd of chimera foundations.

@bluchrystals @Nightphoenix Thank you, that's very useful. Is there anyway to find horses with chimerism in the search?

Even the Basic Sort and Advanced Sort options do not list chimera. This is a relatively new development in the game, still less than a year old, I think. Certainly not much more than that, although time does get away from me. Ammit might have an idea if there might be a plan to add it in the future, but I'm pretty sure there are other things higher on the priority list.

If you go to search ; i think on the second page there is abox to check or uncheck for chimera or non chimera > uncheck the Non and you ll see all of the chimeras in game ; uncheck lined on the first page and you ll only see the foundations ; which will give you an overview of the Herd Helpers that carry it :)

Regardless, that horse is COOL! =P~

Ammit has said in the past the chimera mares are more likely to pass chimera onto their offspring.