Colic in horses, is a very serious problem. That all horse owner should be well aware of. Many different diagnostic tests can be used to diagnose the cause of equine colic, which may have greater or lesser value in certain situations. The most important distinction to make is whether the condition should be managed medically [...]
Colic in horses and feed management.
Horses generally will not ingest moldy feedstuffs if given a choice, but moldy hay or spoiled silage can be deadly if the horse is forced to eat either.
Far and away the more important cause of colic is improper forage grain ratios in feed.
The horse is a wandering herbivore, a continuous grazier and has an absolute requirement for long stem hay or pasture, the horse has evolved eating mainly grass.