Join Date: May 2009
Location: Mid Northern TN
First, what is the pasture like? Is he actually on good grazing pasture, or is it eaten down end of year stubble? If the latter, first step would be to add in hay, preferably all he can eat if you're trying to get weight on him as winter settles in.
Once he's getting all the forage he wants and can eat, then the other feeds (oats, beet pulp, rice bran, pelleted feeds, etc) start coming into play. Horses are graze feeders, so the more you can break up meals into smaller feedings, the better they will be digested and absorbed. The general rule of thumb is to never feed more than 5lbs of concentrate at one time, so if you up the amount of what you're feeding, it will certainly be best to break it into at least two or three feedings a day.