“…Knowledge based on sound economics is sparse, and in Europe the cost of clinical respiratory disease has been difficult to quantify accurately. With the exception of one or two examples (Thomas and others 1978, Wiseman and others 1979), most of the data on the morbidity and mortality due to respiratory disease in growing cattle originate from North America. Reviewing the literature on morbidity and mortality in feedlot cattle between 1955 and 1984, Kelly and Janzen (1986) showed that the morbidity ranged up to 69 per cent, and was most commonly between 15 and 45 per cent, and the mortality was up to 15 per cent, and most commonly between 1 and 5 per cent, with the most frequent clinical and postmortem diagnosis being respiratory disease.…”