Multi-mineral salt blocks are hard, rock-like manufactured blocks that contain a range of trace elements. They can be scattered around a farm for animals to lick. The blocks are usually mainly salt (sodium chloride), but can also contain calcium, iodine, copper, cobalt, iron, selenium and zinc.
Te whakamahi i tēnei tūemi
Natural Sciences Image Library of New Zealand
Photograph by G. R. Roberts
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