Even skilled practitioners have a hard time sorting out all these enzymes. However, one of the most interesting things the enzymes do for us is to give our bodies a chance to work less. These enzymes digest the milk for you, thereby reducing the load on your pancreas.
Here is another quote from the raw milk facts web site, "The amylase, bacterially-produced lactase, lipase and phosphatase in raw milk, break down starch, lactose (milk sugar), fat (triglycerides) and phosphate compounds respectively, making milk more digestible and freeing up key minerals. Other enzymes, like catalase, lysozyme and lactoperoxidase help to protect milk from unwanted bacterial infection, making it safer for us to drink."