Pigs, Nutrient requirements, Mineral nutrition
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Only 16 of the one hundred odd chemical elements known are considered to be essential mineral elements for pigs.
As some of these are required in much smaller quantities than others, they are referred to as trace or minor elements, while the remainder are called major elements.
Godfrey, N W.
"The pig's need for minerals,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 10
, Article 9.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol10/iss10/9