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<title>Abstract</title> This edition is a thorough revision of the previous. There are 3 chapters on general principles, natural sources of minerals, and detection and correction of mineral imbalances in animals. Individual chapters are given to Ca, P, Mg, Na and Cl, K, S, Co, Cu, I, Fe, Mn, Se, and Zn. Three final chapters cover occasionally beneficial elements (B, Cr, Li, Mo, Ni, Si, Sn, V), essentially toxic elements (Al, As, Cd, F, Pb, Hg), and design of supplementation trials for assessing mineral deprivation.