I would put him on 3 pounds oats, 6 pounds of Beet pulp, and 1 pound of Calf-Manna, 1 pound of Stabilized Rice Bran, a feeding.
Is the 1370 empty or full, it would help to know that first. Weigh him full and then weigh him empty, we do this by weighing in the morning for full, and weighing at the end of the day after they have been stalled all day for empty (no feed or water in the stall). This will let you know how much weight you really have to pull off of him.
We have used this method to pull weight off of a few:
3 days prior to fair;
Evening: remove water trough, give steer a 5 gallon bucket of water with electrolytes . Full feed and hay
2 days prior :
Morning: Give steer 5 gallons of water with electrolytes (3 scoops) we use Refresh from Sullivan's. Full feed and hay
Evening: Give steer 2.5 gallons of water with electrolytes (3 scoops) do not leave it in over night once he drinks remove it. ½ ration of feed and flake of hay
1 Day prior:
Morning: 1 Gallon of water with 6 scoops of electrolytes, Flake of hay
Evening: ½ gallon of water 8 scoops electrolytes (you may need to drench him with this if he won't drink it). Half flake of hay
Day of: once at the fair he gets nothing until you weigh in.
Immediately after weigh in: 2 gallons of water 8 scoops of electrolytes, 3pounds of beet pulp/oats (wet), hay.
One hour later: 2 gallons of water 4 scoops of electrolytes, 2 pounds beet pulp, 1 pounds grain, 1 pound oats, flake of hay.
One hour later: Offer half bucket of plain water
Evening: Water him; feed him 3pounds beet pulp, 2 pounds grain, 1 pound oats, flake of hay. Give him tube of Pro-biotics. (Cellarator Turbo Paste)
Day after weigh in: (morning and evening) He should be back to normal as far as eating a drinking goes. Feed him his regular feed ration, full flake of hay and water often.