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Influence of Footbathing on Prevalence of Digital Dermatitis after Introduction of Diseased Animal into Healthy Dairy Herd
B. Zemljic
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On several intensively managed dairy farms, where disinfectant barriers were regularly used, we discovered that after introducing one cow with digital dermatitis, prevalence of digital dermatitis rose enormously. This rise in the number of cases was significantly higher in herds where disinfectant barriers were regularly used.
Bacteriological analyses of samples showed that in all herds we normally found on the heels and interdigital space of the claw Spherophorum necrophorum and Bacteroides nodosus and often also Clostridium perfringens. In occult clinical cases of digital dermatitis we found also Treponema spp., and in most cases two types of spirochetes.
Prevalence of digital dermatitis after introducing a diseased animal was much higher in the herds where disinfectant barriers were regularly used than in herds without footbathing. Where different organic acids or copper sulphate were used incidence was higher than in cases where formaldehyde as disinfectant was used.
Our conclusion is therefore, that maceration of the digital and interdigital skin must be an important factor in establishing digital dermatitis. Furthermore, we think that all infectious elements are not able alone to provoke outbreak of the disease if prior maceration and micro trauma on the skin above claws did not occur ...
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