[Illicit use of nandrolon (19-nortestosterone) in animal husbandry. A proposal for a screening procedure [for the research in the meats]]

acide butyrique acido butirrico alimentation des animaux alimentazione zootecnica anabolics anabolisant anabolizzanti animal feeding beef blood sampling bovin butyric acid carne de res cattle chromatographie en colonne column chromatography ensayo espectrometria esteroides ganado bovino metabolites metaboliti metabolitos orina spectrometrie spectrometry steroidi steroids testage testing urina urine viande bovine