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  • Title: Excess manganese ingestion in the chick.
    Author: Southern LL, Baker DH.
    Journal: Poult Sci; 1983 Apr; 62(4):642-6. PubMed ID: 6866900.
    Abstract:
    Two experiments were conducted with young chicks to investigate effects of excess manganese, (Mn) ingestion and to compare MnCl2 . 4H2O, MnSO4 . H2O, MnO2, and MnCO3 as sources of dietary Mn activity. Each source of Mn was added to a conventional corn-soybean meal diet to supply 3000, 4000, or 5000 mg/kg Mn. High levels of dietary Mn from MnSO4 . H2O and MnCl2 . 4H2O depressed growth slightly; MnO2 and MnCO3 did not affect chick performance. Manganese dioxide contained less Mn activity than MnCO3, MnSO4 . H2O, or MnCl2 . 4H2O as assessed by relative depressions in hemoglobin and hematocrit and by relative increases in bile, liver, and bone Mn concentrations. Neutralization of the chloride ion in MnCl2 . 4H2O with NaHCO3 did not ameliorate the adverse effects of excess, MnCl2 . 4H2O ingestion. Bone and bile Mn concentrations reflected Mn intake better than liver Mn concentration or rate and efficiency of weight gain.
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