An abattoir study of tuberculosis in a herd of farmed elk

abattoir abattoirs aetiology age age differences alberta cervus cervus elaphus disease prevalence disease transmission distribution naturelle edad epidemiologia epidemiologie epidemiology etiologia etiologie fascioloides magna hatos herds lesiones lesions mataderos mycobacterium mycobacterium bovis natural distribution sex sex differences sexe sexo transmission des maladies troupeau tuberculose tuberculosis