I bought a lighter steer (450 lbs) on october 28th 2011 I need him to weigh in at 1100 lbs on august 15th. He is a high quality steer. I am free feeding 2nd cutting grass alfalfa hay mix, and I have started him on 4 lbs of country acres sweet mix plus. The sweet mix has 9% crude protein, 2.5% fat. He has fresh water and a mineral salt block available at all times.. I need suggestions on what to feed him to give optimum weight gain.. I would like him to be around 1200 for my show if that is possible...I have around 287 days to reach that goal...any suggestions will be most welcome, as well as a feeding program I should put him on. Do you suggest feeding rumensin or 38n?