I have brought horses in this condition up to par on timothy hay, grass and oats. I start the oats at 1 coffee cup once daily then on the fourth day feed it twice daily, gradually building up to approx. 2 lbs twice daily. Once the weight is on, the oats are backed off to a pound 2x daily. By feeding hay along with available grass the horses get a variety of nutrients. They seem to know what they need and will graze so long then head for the hay. They also get a cup of loose salt in a pan that is replenished as needed, plus a lick that's out of the weather. This feeding program has worked on various breeds that were badly underweight. I've never had a problem getting weight on a horse. Luck? Maybe but so far my program has worked well.
Last edited by Saddlebag; 06-05-2013 at 08:39 AM.