Botulism was diagnosed clinically in grazing cattle on three closely sited dairy farms. The evidence suggests that the source of the toxin was poultry carcases containing types C and D Clostridium botulinum. These organism were also found in the alimentary tract of affected animals. Silage is suspected as having acted as a vehicle for the organisms and, or, toxins in cases which occurred later in housed cattle on one of the farms.
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