Many cow/calf operators with extra pasture keep their calves after weaning and “background” them to sell as yearlings for the feedlot. Others may buy calves to background on pasture. All calves on grass lack the energy necessary to make efficient gains and often are short on protein as well. Supplementing growing cattle on pasture can be accomplished by hand feeding grain and supplement in a bunk; hand feeding cubes; or offering a self-limiting diet in a self-feeder. Stocker cattle on pasture should be implanted with a growth stimulant for more rapid and efficient gains. An ionophore in the ration will improve rate of gain and feed efficiency. Controlling internal and external parasites will also improve animal performance.