A proven bucking horse can be sold for $8000 to $10,000 or more, making "rough stock" a valuable investment worth caring for and keeping in good health for many years. Likewise, bucking bulls are also selectively bred. Most are allowed to grow up in a natural, semi-wild condition on the open range, but also have to be trained in order to be managed from the ground, safely loaded into trailers, vaccinated and wormed, and be loaded in and out of bucking chutes.