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The administration of a 50% (w/v) zinc sulphate solution by drenching gun to lactating dairy cows (30 mg Zn/kg/d) during the spore ingestion phase of a mild natural facial eczema outbreak had a marked prophylactic effect as judged by serum gamma-glutamyl transferase values. Weight changes recorded over the period of the experiment indicated that the zinc doses may also have caused inappetance or marginal toxicity under the conditions of the experiment.
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