Further analyses indicated that this mutation arose relatively recently in equine evolution and was spread by horse breeders. (sciencemag.org)
And one of the few fee increases in the state budget included one aimed at horse breeders. (nystateofpolitics.com)
Evolution is, in fact, a work in process, as dog breeders all over the world, along with horse breeders, wheat farmers, rose growers, cattle farmers and all other professions that depend on the traits of plants or animals to make their living, selectively breed for desired traits. (religion.blogs.cnn.com)