Vitamin Tolerance of Animals (1987) / Chapter Skim
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Introduction
Introduction
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Thus, it must be the goal of the animal producer, feed manufacturer, and veterinarian to provide vitamins to animals at levels that are sufficient to prevent vitamin deficiency disease and that can be well tolerated. To ensure vitamin tolerance in animal production, there is the practical need to define maximum tolerable levels.
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Presumed upper safe levels for specific vitamins, therefore, will be less than maximum tolerable levels. The presumed upper safe level for each vitamin will vary according to the chemical form of the vitamin; the route of administration, for example, oral versus parenteral; the length of exposure, for example, acute versus chronic; and the particular species and developmental state of the animal, according to such species-dependent variables as degree of endogenous synthesis and efficiencies of absorption, retention, and tissue storage.
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