Join Date: May 2009
Location: Mid Northern TN
Horses need forage and vitamins and minerals. Decent quality hay plus a 'ration balancer' aka vit/mineral supplement is pretty much all most horses need, especially easy keepers and horses in light or no work. It's really very simple, though we humans like to complicate it. Unless a horse is working hard enough that they can't eat enough grass/hay to keep their weight where it ought to be, it probably doesn't need any grain. Most complete feeds require you to feed 5-10 lbs/day to get enough vit/minerals, which is more than many/most horses can have without getting fat, so the ration balancers, designed to be fed at a pound or so a day are a better choice for easy keepers.
If your guy has joint issues, I'd probably keep up on the joint supplement and regular light exercise too.