HGG Community Forums

I wish I had mu - I'd be happy to help. I think she's gorgeous!

Did you ever get the genes you wanted?

@ClassicCreations yes you are correct, those white manes are caused by being homozygous mushroom!

If I remember correctly it is a gene that is common in shetland ponies. Wait ill check on this.

So I found the original topic where Ammit introduced the mushroom gene to us: https://www.huntandjump.com/forum/discussion/30295/brand-new-for-june-mushroom-gene-till-june-15th-closed#Item_50

I was correct, it is a real gene found in the shetland breed.
Copied from the topic: "Mushroom is a real homozygous recessive gene, found in the Shetland breed. The exact location is not known but they know roughly where it is located and there is now a test for the gene. The Mushroom gene appears to acts only on red pigment and desaturates the color leaving a sepia hue to the coat. Manes and tails range from slightly diluted to near pure white. For a long time there was speculation if the gene was even real. The color is not quite cream, not quite dun, not quite silver."

There are many examples in that topic if you'd like to see what mushroom looks like. However, some horses might have gone completely white as they have appy and are very old or even deceased now.
I also see that some of the original example horses got changed, so it might not be the best example thread but at least you can find some mushrooms in the comments and otherwise you could always use the search to find some more mushroom examples.