Originally Posted by Alwaysbehind
We (general we) tend to over supplement our horses. (Says me whose one horse gets a way too big smartpak every day.) Good quality hay/pasture should be enough for the average horse.
If he is failing to thrive on that, then you can look further into supplements.
I agree wholeheartedly with this. So many people overfeed with the wrong feed and over supplement and some are surprised when their horse fails to look better on so much stuff that is supposedly "good" for them. A horse's digestive track was designed for digesting stemmy fibery food like coarse grass and tree twigs. Certain grains are hard for them to digest and other things like corn don't get digested at all so it doesn't even qualify as a filler.
I am a devout believer in keeping things as simple as possible. My horses are currently getting free choice grass hay or grass/alfalfa mix hay and a trace mineral salt block. With the exception of the very hard keeper TB and the old retired guy who has other ongoing health problems (both of which we are working to remedy), they are all fat, slick, healthy, and happy. Even my colts that are getting worked every day only get alfalfa hay and they all stay shiny and healthy.