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During the last quarter century progress has been great in methodology for mineral and nutrition research, especially as it relates to analytical instrumentation and use of radioactive isotopes. Vastly greater numbers of both research and farmer samples are analyzed now for mineral elements resulting in much better understanding of variability of content of feeds. Important progress has been made in dairy cattle in understanding the nutrition and metabolism of certain mineral elements including zinc, copper, iodine, selenium, manganese, iron, magnesium, potassium, chlorine, calcium, phosphorus, and sulfur. Substantial interest and work
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W.J. Miller (1981) studied this question.
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