"Grey horses are born colored, but over time they go through hair depigmentation. Most white horses were born grey, but as they age, their coats turn fully white."
"Young horses start shedding their hair after birth and this continues through various grey shades until the horse turns white around eight."
"Grey horses have a grey gene that acts on the melanocytes found in the hair follicle."
"While it’s possible to get a grey horse by owning a horse with a grey gene, most people prefer breeding two grey horses together."
"Breeders can tell that a newborn horse is likely to turn grey when they check the fur around the horse’s eye."