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“Manganese is very poorly absorbed in ruminants, and limited research suggests that high dietary calcium and phosphorus may reduce manganese absorption.”
“Rats fed massive doses of manganese (1\m=.\73%of the dry diet) show decreased intestinal absorption of calcium and phosphorus (Chornock, Gerrant & Dutcher, 1942).”
“ Phosphorus enrichment resulted in extensive precipitation of calcium, magnesium and manganese , markedly reducing the soluble and easily available fractions of these metals.”