True manganese absorption in chicks as affected by dietary excesses of calcium and phosphorus

Conference · Fri Mar 15 00:00:00 EST 1991 · FASEB Journal (Federation of American Societies for Experimental Biology); (United States)

OSTI ID:5213435

Wedekind, K J; Titgemeyer, E C; Twardock, A R; Baker, D H ^[1]

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1. Univ. of Illinois, Urbana (United States)

Two balance studies with growing chicks were conducted to evaluate the effects of excess calcium (Ca) or excess phosphorus (P) on endogenous fecal manganese (Mn) excretion and true Mn absorption determined using an isotope-dilution technique. Supplements were added to a corn-soybean meal diet containing 1% Ca, 0.7% P and 37 mg/kg Mn. In Exp. 1, supplemental Ca levels of 0, 0.5 and 1.0% from feedgrade limestone were compared. True absorption of Mn was not affected by Ca level and averaged 2.8% for birds fed the Mn-unsupplemented diet. In Exp. 2, a 2 x 3 factorial arrangement of treatments included: 100 and 1,000 mg/kg supplemental Mn and 0, 0.4 and 0.8% added P supplied by dicalcium phosphate. Excess P decreased true absorption of Mn. In birds fed 100 mg/kg supplemental Mn, absorption of Mn decreased 22% as excess P increased from 0 to 0.8%, whereas in birds fed 1,000 mg/kg supplemental Mn, Mn absorption decreased 58% as a result of 0.8% P supplementation. These results confirm that excess Ca has little effect while excess P has a marked effect on gut absorption of Mn.

• OSTI ID: 5213435
• Report Number(s): CONF-9104107-; CODEN: FAJOE
• Journal Information: FASEB Journal (Federation of American Societies for Experimental Biology); (United States), Vol. 5:5; Conference: 75. annual meeting of the Federation of American Societies for Experimental Biology (FASEB), Atlanta, GA (United States), 21-25 Apr 1991; ISSN 0892-6638
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CALCIUM
BIOLOGICAL EFFECTS
MANGANESE
METABOLISM
PHOSPHORUS
CHICKENS
DIET
INTESTINAL ABSORPTION
ISOTOPE DILUTION
ABSORPTION
ALKALINE EARTH METALS
ANIMALS
BIRDS
ELEMENTS
FOWL
ISOTOPE APPLICATIONS
METALS
NONMETALS
TRACER TECHNIQUES
TRANSITION ELEMENTS
UPTAKE
VERTEBRATES
560300* - Chemicals Metabolism & Toxicology