Current Dairy NRC (2001) requirements for cobalt, manganese and zinc may not be sufficient to meet the needs of the cow. Trace mineral content of feedstuffs and mineral content of water can be quite variable. Antagonists and stress affect trace mineral absorption and utilization. Supplying a portion of the trace minerals from minerals sources, in which the metal is bound to an amino acid, reduces the effect of antagonists and stress on mineral availability.
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