well, i know that this is a question for one of the levels, but you should go to howrseinfo.com
it will give you all of the answers for all of the levels!
horses that are frequently exercised need feed with higher fiber and less suger,
on howrse the answer is increased protein and carb.
Howrse answers: Increased carbohydrates and protein
Horses that are frequently exercised need what? Increased protein Increased carbohydrate
Salt
Frequently exercised horses need extra minerals and grain.
increased fat
they need a good diet too produce energy, also electrolytes too replace lost fluids.
In real life, yes, a horse at work will need more protein than he will when not at work. Not exactly... You just have to make sure that they are getting the amount of food needed. On Howrse you can't give them 'extra protein'!
oaten chaff lucine chaff bute
Food and care. And usually a horse will want to take a little rest.
They need carbohydrates