Toxicity of zinc in ruminants in relation to facial eczema

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Extract The toxicity of zinc salts to ruminants has been studied by Ott et al (4) Ott, E. A. , Smith, W. H. , Harrington, R. B. and Beeson, W. M. 1966. Zinc toxicity in ruminants. I. Effect of high levels of dietary zinc on gains, feed consumption and feed efficiency of lambs. J. Anim. Sci., 25: 414–481. [Web of Science ®] [Google Scholar] (5) Ott, E. A. , Smith, W. H. , Harrington, R. B. and Beeson, W. M. 1966. Zinc toxicity in ruminants. II. Effects of high levels of dietary zinc on gains, feed consumption and feed efficiency of beef cattle. J. Anim. Sci., 25: 419–423. [Web of Science ®] [Google Scholar] (6) Ott, E. A. , Smith, W. H. , Harrington, R. B. , Stob, M. , Parker, E. H. and Beeson, W. M. 1966. Zinc toxicity in ruminants. III. Physiological changes in tissues and alterations in rumen metabolism in lambs. J. Anim. Sci., 25: 424–431. [Web of Science ®] [Google Scholar] (7) Ou, E. A. , Smith, W. H. , Harrington, R. B. , Parker, H. E. and Beeson, W. M. 1966. Zinc toxicity in ruminants. IV. Physiological changes in tissues of beef cattle. J. Anim. Sci., 25: 432–428. [Google Scholar] and others (3) Miller, W. J. , Clifton, C. M. , Fowler, P. R. and Perkins, H. F. 1965. Influence of high levels of dietary zinc on zinc in milk, performance and biochemistry of lactating cows. J Dairv Sci., 48: 450–453. [Google Scholar] (16) Zurcher, T. D. 1970. “A study of the zinc requirement of beef cattle”. In PhD Thesis, Purdue University. [Google Scholar] (2) Feaster, J. P. , Hansard, S. L. , McCall, J. T. , Skipper, F. H. and Davis, G. K. 1954. Absorption and tissue distribution of radio zinc in steers fed high-zinc rations. J Anim. Sci., 13: 781–788. [Google Scholar] (12) Thompson, A. , Hansard, S. L. and Bell, M. C. 1959. The influence of aluminium and zinc upon absorption and retention of calcium and phosphorous in lambs. Anim. Sci., 18: 187–197. [Google Scholar] (9) Rosenberger, G. and Gruender, H. D. 1975. “Experiments on the toxicity of zinc dusts in cattle”. In 20th World Veterinary Congress Summaries Vol. 2 Thessaloniki Greece 920–921. [Google Scholar] . In much of this work zinc has been incorporated in the feed, a situation more applicable to intensive feedlot farming rather than the New Zealand pastoral situation, or the zinc has been fed for limited periods of time with the possibility that the full potential of zinc for causing toxicity has not been realised.