Ones that got beaten up by the other oats :lol: Sorry, couldn't resist. I found this which may prove useful:
Types of oat
• Whole oats: These are as they come from the field, complete with the husks (or outer casing). This means they have the highest fibre level of all oats and grains. However, very young horses or veterans with teeth problems may have difficulty chewing these, so will not get the full nutritional benefit.
• Bruised oats: The husk of the oat is broken to allow access to the nutrients. Bear in mind that this process will shorten the shelf life of the oats to a few weeks.
• Rolled oats: Rolling has a similar effect to bruising. Traditionally, horsemen would buy whole oats and roll them on an ad hoc basis to maximise storage time.
• Crimped oats: This process damages the husk and increases the surface area, so the digestive juices can get to work more effectively.
• Clipped oats: Oats are often clipped alongside bruising. The ends of the grain are trimmed to give a neater final product.
• Crushed oats: This is a rougher process, which involves breaking both the husk and the kernel of the oat. This makes them slightly more digestible, but they suffer from an even shorter shelf life.
• Naked oats: These are not processed, but are grown to have loose husks that are shed when harvested. This lowers the fibre content and increases digestibility. In addition, they have a third more digestible energy and protein than a standard oat, plus they are high in oil. These elements are the 'rocket fuel' in oats.