A new South Dakota State University (SDSU) online publication discusses raising cattle without implants, ionophores or antibiotics. In the publication, "Feeding Natural Cattle" (find it at agbiopubs.sdstate.edu/articles/ExEx2056.pdf), SDSU Extension personnel Tyler Melroe and Erik Loe detail the market potential for "natural" beef, the requirements of such a management and marketing program, and the attributes, drawbacks and economics of "natural" feeding.
-- Joe Roybal