Mushroom gene
From Wikipedia, the free encyclopedia
Identified in 2014,[1] the mushroom gene is a recessive dilution gene that affects red pigment in horses.
On a chestnut base coat the horse is born a pale beige with sometimes a greyish or pinkish tint and often keeps that color when it becomes an adult, but some turn darker when an adult.[2]
On a bay base the horse is born a yellowish beige with a dark contrast stripe on the back, and as it grows older the horse will resemble a buckskin.