I can't remember where I found it but I saved it (2 pages) on my Bro-in-law's web site! :>)
http://www.gohotsprings.com/ranchman/mad_cow1.htm
I still agree with this theory for now:
As an organic farmer, Mark Purdey resisted the order to spray his cattle with organophosphates for warble fly and went to court for a judicial review; he won and was exempted from using the spray. No cows born in his herd developed BSE (mad cow disease). He has contributed numerous articles on the subject of BSE to scientific journals. He farms in Somerset, UK. This article appeared in Wise Traditions in Food, Farming and the Healing Arts, the quarterly magazine of the Weston A. Price Foundation, Spring 2000
That is why we purchase our meats from like farms where the animals are grass-fed, raised for us without all of the injectibles. The farmer makes a better living and we get meat "the way it used to be".
See "grass-fed" on the web for more information.
See also http://www.smithsonianmag.si.edu/smithsonian/issues00/jul00/farm.html