Not to offend any of the SH breeders, but with the purebred SH steer you need to get him on full feed, as I was told by the breeder we work with "you need to keep feed in front of the shorthorns." Start with a developer, something with 14 protein and around 3 fat, at about 6 to 7 months I would switch over to a feed with 11 to 12 protein and 4.5 fat. Work him up to 3 percent and daily exercise.