Which Cavalo breeds come in Ruço?

Club breed standards describe Ruço for the Crioulo e Tennessee Walking Horse.

Cavalo pattern

Ruço

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

32 Cavalo breeds list Ruço. It is in a club standard for 2 breeds.

Breed	ACCC	ABCCC	TWHBEA
Crioulo	Padrão (“se aceptan todos los pelajes”)	Padrão (“Tordilha”)	No ruling
Tennessee Walking Horse	No ruling	No ruling	Padrão (“Grey”)

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