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A chimera is essentially 2 horses fused into 1- that is what causes the 2 separate DNA strands you see on chimeric horses.

Breeding to produce chimeric foals is purely reliant on luck. There was an awesome spreadsheet developed by someone (can't remember for the life of me though who it was..) who bred chimeras and kept track of the resulting lined foals and whether they were or were not chimeric. Very low odds basically. It is still a fun project and funnily enough I have a 3rd generation chimeric colt that comes from a chimeric sire whose sire was also chimeric- that was just sheer luck though and not something I actually bred for.

Breeding chimeric horses to chimeric horses does sliiightly increase your odds of producing a chimeric foal but it really is a numbers game and even from the same sire/dam that has produced a chimeric foal in the past, it might never happen again in that horse's breeding career. Vice versa- you might have a nonchimeric sire or dam produce several chimeric foals randomly but again very low odds.

ETAL I went searching and I found the speadsheet! It was by VorpalAlice and there is another one by morningice. This is an excellent thread to read through if you decide you might be interested in tackling chimerias!

https://mesa.huntandjump.com/forum/index.php?p=/discussion/comment/72478#Comment_72478

However! There is an open (no license necessary) gene that can mimic chimeric markings. It is DFP1 (Dun Factor Promoter 1), and looks stunning in my opinion.


GH Onethia