Which 马 breeds come in 青毛?

Club breed standards describe 青毛 for the 克里奥洛马和田纳西走马.

马 pattern

青毛

Progressive whitening with age: a horse born colored turns gray and finally white, often dappled or flea-bitten on the way.

32 马 breeds list 青毛. It is in a club standard for 2 breeds.

Breed	ACCC	ABCCC	TWHBEA
克里奥洛马	符合标准 (“se aceptan todos los pelajes”)	符合标准 (“Tordilha”)	No ruling
田纳西走马	No ruling	No ruling	符合标准 (“Grey”)

How 青毛 can appear or change over an animal's life.