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  • Title: Suspected monensin toxicosis in feedlot cattle.
    Author: Geor RJ, Robinson WF.
    Journal: Aust Vet J; 1985 Apr; 62(4):130-1. PubMed ID: 4026719.
    Abstract:
    Suspected monensin toxicosis was seen in feedlot cattle aged 6 to 9 months. Twenty cattle died following inclusion of monensin in the feed at 400g/tonne, which was 13 times the recommended level. The deaths occurred over 2 weeks. Clinical signs were inappetance, respiratory distress and sudden death. Post-mortem features were those of right-sided heart failure and included dependent subcutaneous oedema, ascites, hydrothorax, and periancinar hepatocyte congestion and necrosis. However, in contrast to previous reports no myocardial necrosis was found, but focal skeletal muscle necrosis was observed. Additional findings were marked pulmonary oedema accompanied by fibrin and erythrocyte exudation into alveoli and interlobular lymphatics. From these findings it appears that monensin, as well as affecting both cardiac and skeletal muscle, has a primary effect on lung vasculature.
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