I prefer loose mineral, myself, and "most" of those have enough salt in them for daily needs, as well as other essential vitamins and minerals.
I just don't know that a horse will always get enough off of the hard blocks...there is a salt lick at the place that I board that all the horses can get during turnout 5 total, and there is still well over 3/4 of the thing left (that one was put out there in June!)...the loose mineral that I keep in my mare's paddock, however, gets refilled fairly often...I usually put about 3 C. Out for her, and have to check it weekly. Most loose minerals are designed to feed free choice, OR if you're overly concerned for the horse to get a set amount each day, one can feed it daily in feed as well, usually it's no more than 2 oz. I simply feed free choice.
That said, regarding salt itself, if you feel your horse needs a bit to replenish his body after a hard work out, get something like AppleDex or something like that; you can put that in his feed, and it will replenish his electrolyte balance and encourage him to drink.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 09-29-2010 at 12:19 AM.