My experience with Holstiens is not to "background" them at all. I've had best results by putting them on full feed of a high energy finishing ration right after weaning. If they are allowed to grow out to 700-800# in a traditional backgrounding operation then put on a finishing ration, they will weigh 1600# plus before they begin to get any fat cover at all. However, by starting them on finishing at 300#, when they are very young and their feed efficiency is at its highest, they will have enough fat cover on them at 1100-1200# to MAYBE grade select and have a much more marketable carcass. Remember, these are very big dairy animals bred for milk production only. Not moderately framed animals bred for meat.