Animal Antibiotics Transfer to Crops Through Manure  A study by  researchers at the University of Minnesota shows that antibiotics used on livestock can appear in food crops grown in soil treated with livestock manure, says an Environment News Service story. The research appears in the June 2007 issue of the Journal of Environmental Quality, and shows that corn, lettuce and potatoes grown on greenhouse soil treated with manure containing the common livestock drug Sulfamethazine take up the drug. The study  indicates that organic crops may be at particular risk of antibiotic contamination because they are frequently fertilized with animal manure.