I have fed out a few, and the main thing I have observed about Longhorns is that is takes a lot longer to finish out a Longhorn steer than most other breeds. I usually let them stay on grass until they are a least 20 months old, at which time I'm hoping they might weigh in at 700-900 lbs. I then drylot them with some hay, and put them on feed for somewhere between 75-120 days, ramping them up to around 25lbs a day, broken into 2 feedings. Finished weight I am shooting for is around 1000-1100 lbs.