Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Dr. Getty
Hi Mary,
The amount of Ultium you feed really depends on how well he is maintaining his weight. If he requires the intense activity level amount, be sure to limit each meal to no more than 4 lbs (weigh your feed to be sure). Any larger than that, and there is a high risk of colic. So, you may need to feed more than twice a day.
Another important factor to consider is having frequent stops so he can eat hay or pasture. He should not go for more than 2 hours without anything in his stomach. His stomach releases acid constantly and endurance horses easily develop ulcers while on the trail for a long period of time.
Regarding salt -- electrolytes are only good to replace sweat -- they do not cover his sodium or chloride requirements. Therefore, in order for an electrolyte supplement to work, he needs to be in good sodium balance before hand. Check the level of sodium in Ultium -- he should have 35,000 mg (35 g) of sodium at the bare minimum. If he won't lick the salt block, add one tablespoon of table salt to each meal.
Also, chloride cannot not be met by salt or electrolytes, only hay. So be sure he has a full stomach before setting out on the trail.
Thanks for writing!
All the best,
Dr. Getty 
Where are you from? Bayfield, CO