The role of zinc as an essential micronutrient in animal life was not well established until recently. For the first time Todd et al. (1934) produced zinc deficiency in rats. The essential role of zinc in animal nutrition is through its effect as a metaloenzyme in the production of DNA-dependent RNA polymerase (Wacker and Vallee, 1959).
KeywordsPlacebo Zinc Nickel Albumin Chromium
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