An effect of zinc sulfate addition to the feed ration on the level of carotens in blood serum and of vitamin A in the liver as well as on the course of pododermatitis in cattle was investigated. Supplementing the feed ration with zinc sulfate limited the occurrence of new pododermatitis and paronychia bovum cases in the examined herd. It produced a beneficial effect on the course of these changes in the digits. A relationship between the levels of carotens in blood serum and vitaminum A in the bovine liver and therapeutic effects on the presented digit diseases was found.
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