[Feed analysis: Progress - problems]

additif aux aliments des animaux aditivos de piensos aflatoxinas aflatoxine aflatoxins aliment pour animaux analytical methods antibiotics antibiotique anticoccidials anticoccidien bifenilos policlorados coccidiostaticos enzyme preparations feed additives feeds fitasa heavy metals metales pesados nutrientes nutrients phytase piensos polychlorinated biphenyls substance nutritive technique analytique vitaminas vitamine vitamins