So if you have a horse that is 1 out of 180, that means there is 180 other horses with that exact color.

Color Breeding usually has the goal of breeding 1 out of 1's, meaning it is the only horse in the game with that specific color combination. There are also other interpretations of color breeding, including people who breed for a specific color, or the recent trend where people are breeding for Homozygous genetics.

Hope this helped! :)