HGG Community Forums

I don’t think this is a bug- I think it’s due to your horse’s chimerism!

Basically the way chimera creates work is one set of DNA is generated based on the Herd Helper’s parameters. Then for the second set of DNA, the game takes the first set it created and changes one random allele. The two sets of DNA are then merged together to create the horse. The second set of DNA does not have to be exactly what the herd helper specifies.

On your chimera, you can see that DNA set one is Grullo, which is the dun gene acting on a black base- the black base is caused by the two recessive a/a alleles (combined with having at least one E). On the second set of DNA, you can see that one of the little a alleles was changed to a big A, which, since A is dominant over a (aka bay is dominant over black) changes your horse’s second dna to a bay base- and thus a bay dun, since nothing else changed.

So it makes for a really cool chimera, but no bug! I’ve got a clean slate stallion that had a similar thing happen:

FNDC New Year Advantage

He’s grullo on the first set of DNA like the herd helper specifies, but brown dun on the second since one of his little a’s got changed to t, which codes for brown and is dominant over black (a).

(Please forgive me if this explanation is way too rambling, I am up… way later than I should be and my brain is kinda running in circles.)

Basically the second strand doesn’t like to follow the rules. I have a mare that’s hom W1 on her second strand, which would be lethal to most horses :)