The word colic simply means pain associated with the abdomen. Usually this pain originates from the intestines but other causes of abdominal pain that may be confused with intestinal colic are foaling, tying up, and kidney/bladder problems.
Horses can become quite painful and agitated relatively quickly depending on the colic type. If you believe the feed is the problem, there are a few things you can do.
Be sure that all feed is stored behind closed doors. If for some reason a horse manages to escape from their stall and gets into a feed bin or storage container, they can overload on carbohydrates resulting in colic.
Nutrena Safe Choice ia a good option when you have a horse with colics.