Experimental Ovine Mastitis; A Pathologic Study

Abstract

Strains of Staphylococcus aureus, Corynebacterium pyogenes, and Corynebacterium ovis isolated from naturally occurring, cases of ovine mastitis in Egypt were inoculated unilaterally via the teats into the mammary glands of 20 native-bred ewes, and the course and pathogenesis of the resulting changes were described. One ewe of the group infected with S. aureus developed mastitis acuta gravis. The other ewes of this group had Galactophoritis et Mastitis catarrbalis chronica et acuta. The ewes infected with G. pyogenes or with mixed G. pyogenes and S. aureus developed Galactophoritis et Mastitis catarrbatis purulenta acuta et chronica. The ewes infected with C. ovis had Mastitis apostematosa chronica. The mastitis was unilateral in all animals.