has subject area Animal Husbandry Anti-Bacterial Agents Chromatography, Liquid Diagnostic Techniques, Radioisotope - Radioimmunoassay Hydrocarbons, Aromatic - Tetracyclines Immunologic Techniques - Radioimmunoassay Mass Spectrometry Molecular Probe Techniques - Radioimmunoassay Polycyclic Compounds - Tetracyclines Water Pollutants, Chemical