Letting holstein steers graze grass while trying to finish them out on grain really slows them down as far as the time it takes for them to finish out. Holsteins just are bred for grazing. I guess type of pasture makes a difference, but as big as they are when they finish out, they need a very large amount of grass just to maintain their condition.
Sometimes we do sometimes we don't. It depends on if there is enough grazing room & if they look finished or not. Oh and the prices at the market. Our show calves get up to about 1000 to 1500 pounds and they are considered finished.