Yes, it is a hot feed, meaning it can make horses a little wired... which is why I don't feed it regularily and only use a handful every once in a while as a treat.
I have never heard of it causing diahrrea though.
Just curious... I checked the pelleted feed and it does have grain in it as well. How different is that from pure oats then? (I mean 2-3 lbs of pelleted according to instruction versus say small cup of oats)
I used to feed a diet high in oats before I knew better.
Yes, it can cause diarrhea. I did not have as much of an issue with horses becoming wired, although it probably depends on the horse.
If I am remembering correctly, oats are high carb, low protein. The carbs would be beneficial, but you also need a decent amount of protein as well (not too high though). Therefore, you would have to feed quite a lot of oats to reach the needed nutrient requirement, which in turn would probably cause diarrhea more easily and a hyper horse.
I have found that I really like the concentrate feeds that list the %nutrients right on the bag - and it gives recommended feeding amounts. I have thought about even blending in a small amount of pelleted alfalfa for my stallion who has some lethargy issues if his diet is not giving him enough energy, but for most horses, I would probably avoid the alfalfa or use it in extreme moderation. Our mare became a nut case when receiving it.
Sorry about the unnecessary tangent - my mind was drifting a bit. :)