In 2008, researchers at Uppsala University in Sweden identified the genetic mutation that governs the graying process. The study also revealed that gray horses carry an identical mutation that can be traced back to a common ancestor that lived thousands of years ago. The discovery that gray can be linked to a single animal provides an example of how humans have "cherry-picked" attractive mutations in domestic animals. Gray is controlled by a single dominant allele of a gene that regulates specific kinds of stem cells.
Today, about one horse in 10 carries the mutation for graying with age. The vast majority of Lipizzaners are gray, as are the majority of Andalusian horses. Many breeds of French draft horse such as the Percheron and Boulonnais are often gray as well. Gray is also found among Welsh Ponies, Thoroughbreds, and American Quarter Horses. All of these breeds have common ancestry in the Arabian horse. In particular, all gray Thoroughbreds descend from a horse named Alcock's Arabian, a gray born in 1700. The gray coat color makes up about 3% of Thoroughbreds.
This is Annie when I first got her. She was four years old and already gray.
(Aw, look at that tail! Her poor tail is nonexistent nowadays!)
This is Annie now. Please excuse the "baby" belly. lol!This is Shahreen, a 17 year old half Arabian. She was flea bitten when I owned her. Her base coat was golden, like a palomino and I was told that she had two palomino foals. I believe the stud was a chestnut. This was Shannon, a dapple gray Thoroughbred. She was 5 in this photo. By the time I sold her at 8, her mane and tail were already graying and her body was a lighter dapple color. I am sure she would turn mostly "white" when she got older.
and is now darkening up with no visible white hairs coming in, I believe she will be a dark brown or black bay like her father.
Of course, I could be wrong! Only time will tell.
You're just a little girl with gray - song: What in the World, artist: David Bowie, album: Low