Determining "what's in your feed bag" should be a top priority.
All too often, we simply just look at the name of the manufacturer or look at the protein content.
And quite honestly, those should be the least of your concerns when it comes to determining what to feed your horse.
Knowing What's NOT in the bag is equally important... Least cost analysis is often used to formulate feed. Feeding from just the bag, quite honestly, you can't get what you need anyway, if it's a so called complete feed. If you look at the bag, it'll tell you how many pounds a certain weight horse should get fed every day.