An exploratory case-control study of risk factors for bovine spongiform encephalopathy on Swiss dairy farms

aliment pour animaux animal diseases animal husbandry bovin bovine spongiform encephalopathy cattle concentrates data collection data processing disease transmission encefalopatia espongiforme enfermedades de los animales feeds ganado bovino genetic disorders infection maladie des animaux piensos piensos concentrados procesamiento de datos riesgo risk risk factors risque spongiform encephalopathy statistical methods suisse suiza switzerland transmission des maladies