Single ingredients won't change the regulations for manufactured feed.  Also you mentioned pellets and as stated above, you will need to use steam and cool the pellets before packaging.  Pellets are difficult at best to produce and involves a lot of trial and error.  With the right setup and enough skill you can succeed with the process, but it isn't for beginners.

If you really want to get into the feed business I would suggest that you start with single ingredient, simple processed feeds such as cleaned oats, cracked corn, etc.  There are lots of feeds that can be simple to process without involving all of the headaches of the blends and hard to process rations.