Join Date: Mar 2009
Location: Washington, USA.
It depends on the rich-ness of the grass, and the kind of grain your feeding. If the grass is green, you need to introduce them gradually. Imagine you lived on nothing but plain buttered toast for years and then the day came when you pigged out on a much richer food, like a steak. You wouldn't feel very good. Start small, 15 minutes, half an hour, an hour, two hours. If the grass isn't that green but still green, you can start out longer and make bigger leaps, it's just the really rich stuff that you gotta watch out for.
As far as hay and grain goes, they will have to be on a LOT of grass to warrant dropping hay. When my grass pasture gets up to par and I put my horses on it, they are only on it during the day and I only feed hay at night because I bring them into my "dry lot" over night. I feed grass hay and alfalfa pellets in the summer, and alfalfa hay and grass pellets in the winter, and supplement as needed.
"Great spirits have always encountered violent opposition from mediocre minds."