Antibodies in calves on feed supplemented with chlortetracycline after vaccination with Brucella abortus strain 19.

Abstract

Twenty dairy heifers each consumed 350 mg of chlortetracycline/day in their feed. Four tests were performed on serum specimens from these and 20 control calves after vaccination with Brucella abortus strain 19. The numbers of positive test results on the card test and mean titers on the tube and rivanol agglutination and complement-fixation tests were… (More)

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