We had a saddlebred gelding visiting us for awhile. He belonged to a friend who was moving into the area. The poor guy arrived very underweight. I think he was underweight before he left his old home, and the stress of the trip made him drop even more. He's a nervous personality.
While he was with us we fed him a mixture of Senior Grain (a coffee can full) with approximately 2 cups of beet pulp, twice a day. (We soaked it, but it probably wasn't necessary.) He was also getting Orchard Grass. In just a matter of weeks he was in good weight, but still had a ways to go.
We've also had a miniature stallion that came to us enroute to another home. He was a rack of BONES. We have kept him here to build him up for the rest of the trip. He was in such bad shape he may not have survived the trip. His diet included free choice Orchard Grass, and a six cup scoop that was a mixture of Senior Grain and small Alfalfa Pellets, twice a day. Again, in a matter of weeks he was in good summer weight.....(He's almost Chubby now!) We never fed beet pulp to him, though.
PS: I need to correct myself..........The miniature stallion WAS offered soaked beet pulp when he first arrived but turned it down, so we ended up feeding as I described above.