A tip from the feed store.
The next time you go to scoop up your horse's daily ration, ask yourself: "Have I read the label on this bag of feed?" Do not assume that the bag you bought today contains the same rations as the bag you bought last week or last month, even if you're buying from the same mill! If you are concerned about what your horse is eating (and most of us are)
READ THE TAG and ask: Is the ration a fixed formula?
If the grains are not itemized on the bag or tag (as they are in a fixed formula) then the grains can fluctuate from one mix to the next at the mill. This means that, say, if the price of corn goes up and the price of barley goes down, there could very likely be more barley in the mix you're buying today. You know what your horse should be eating, and you can make sure he gets what he needs. READ THOSE LABELS!