Earlybird, there are a number of articles on the web ,which may be of use to you, one been
http://www.pork.org/filelibrary/AnimalScience/Alt_Feed_2.pdfIn hindsight I should of maybe gone into more detail and asked 100 questions before giving any answer, however I did not want to treat anyone as a fool and made certain assumptions that one would take advice and research it further to ensure that it fits in with what you want to achieve and still makes economic sense.
We all know that there is no single feed that is completly balanced and therefore feeding alone will not give you the desired results, however and here are a couple of my assumptions, that you are getting the grain for free or at a very good price, that you are intellegent enough to not feed contaminated feed to your animals and that you either choose to do things strictly according to the rules or not and the latter is not for me to judge you on.
I am from South Africa so some of the regulations you have either don't exsit here or are not inforce yet.
One being mixing of feed on farm, which I have been doing this for the past 8 years, but I am fortunate enough to have free access to a diatecian as well as a number of feed sources and have never had any feed associated problems, so I will continue to mix feed irrespective of the law.
I am always looking at ways to improve the efficiency of what I do, even in the good times so that when the bad times come I don't have to play catch up, so I tend to read more and laugh less.