title: Manganese utilization in the chick: effects of excess phosphorus on chicks fed manganese-deficient diets.
abstract: Young chicks were used in a 16-d feeding study to evaluate the effects of excess dietary P on Mn utilization. The basal casein-dextrose diet (1.4 mg Mn/kg) was supplemented with 0, 3.5, 7.0, or 10.5 mg Mn/kg from MnSO4.H2O and was fed in the absence or presence of .8% excess dietary P (equal P contributions from KH2PO4 and NaH2PO4). Diets containing .8% excess P were also supplemented with .8% excess Ca (CaCO3) to keep the Ca:P ratio above 1:25 so as to prevent anorexia associated with excess dietary P per se. Both growth rate and total tibia Mn responded linearly (P < .01) to Mn supplementation in chicks fed the normal level of P, but those fed excess P responded erratically. Excess P did not affect growth or tibia Mn in chicks fed the basal diet, but birds fed diets with supplemental inorganic Mn grew slower (P < .01) and had lower (P < .01) quantities of Mn in tibia when excess P was supplemented. Manganese content in the tibia of chicks fed excess P was 55% of that in chicks fed an adequate level of P.
authors.affiliation: Department of Animal Sciences, University of Illinois, Urbana 61801.
authors.forename: D H
authors.initials: DH
authors.lastname: Baker
authors.forename: G W
authors.initials: GW
authors.lastname: Oduho
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D004032:Diet; D008297:Male; D008345:Manganese / Q000008:administration & dosage* / Q000378:metabolism*; D009751:Nutritional Requirements; D010758:Phosphorus / Q000008:administration & dosage*
chemical_list: D010758:Phosphorus; D008345:Manganese