Managing Changes or Additions to the Horse's Diet

I recently heard from a friend who is at a barn that changed the type of feed they were providing. Sadly, they ended up with a few cases of colic. While I don't know all the details, I thought it was a good topic to discuss - when making changes to a horse's diet, how and why it needs to be done slowly and carefully. Listen in for tips and guides on how to do this and what to do if you need to add something new to the diet as well.