Ringworm - occurrence, control and prevention in young cattle

Edwardson, John (1990). Ringworm - occurrence, control and prevention in young cattle. MPhil thesis The Open University.

DOI: https://doi.org/10.21954/ou.ro.0000fc5c

Abstract

Regular weekly observations of naturally occurring outbreaks of ringworm in young cattle over many years have provided detailed information on facets of the epizoology of the disease, control by therapy and preventive measures.
The epizoology or distribution of the disease demonstrated an average incubation period of 28 days.
Sites of lesions aided detection of early disease with the predominant site for first lesions being around the eyes. In yearlings unusual sites for lesions included the perianal area and under the jaw. All with outbreaks were found to resolve / to spontaneous recovery and in these studies the mean duration of lesions was 4 weeks, duration in animals was 8 weeks, and in outbreaks 18 weeks, in untreated disease of naturally occurring outbreaks. These figures demonstrated the importance of determining spontaneous recovery in assessing the value of therapy in drug trials.
Control by therapy was found to be variable and difficult if not supported by preventive measures.
Controlled drug trials by strict regime have shown the effectiveness of Griseofulvin. However the use of Natamycin or Enilconazole was not so effective if treatment was delayed.
Early therapy with copper naphthenate and cod liver oil was effective when supported by preventive measures. The major obstacle to control on calf and beef units appears to be the frequent introduction of infection via purchases of calves.
Fifteen outbreaks were considered to be introduced through 45 group purchases in 3 years.

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