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The effects of dietary levels of inorganic phosphorus, calcium and cholecalciferol on the digestibility of phytate-P by the chick

Published online by Cambridge University Press:  09 March 2007

A. Mohammed ,
M. J. Gibney  and
T. G. Taylor
A. Mohammed
Affiliation:
Department of Nutrition, University of Southampton, Southampton Trinity College Medical School, St James' Hospital, Dublin 8, Republic of Ireland
M. J. Gibney
Affiliation:
Division of Nutritional Sciences, Department of Clinical Medicine, Trinity College Medical School, St James' Hospital, Dublin 8, Republic of Ireland
T. G. Taylor
Affiliation:
Department of Nutrition, University of Southampton, Southampton Trinity College Medical School, St James' Hospital, Dublin 8, Republic of Ireland
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Abstract

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Male broiler chicks (1-d-old; Ross one) were given either a control diet containing recommended levels of phosphorus, calcium and cholecalciferol or experimental diets low in P and with variable levels of Ca (normal and low) and cholecalciferol (normal or high). The low-P diet with normal levels of Ca and cholecalciferol induced a hypophosphataemia and a hypercalcaemia which was reflected in reduced tibia length and weight and in reduced Ca, P and magnesium contents of tibia. The phytate digestibility remained normal while the retention of P and Ca fell significantly. The lowering of Ca alone elevated phytate digestibility and restored P and Ca retention. The hypercalcaemia and hypophosphataemia remained and tibia mineralization remained impaired. The raising of cholecalciferol alone dramatically increased phytate digestibility and the retention of Ca and P. While this remedied the hypercalcaemia, the hypophosphataemia persisted as did the diminution of tibia weight. The simultaneous lowering of dietary Ca and elevation of cholecalciferol on low-P diets restored all variables to the levels for the control diet. Circulating levels of 1,25-dihydroxycholecalciferol were significantly elevated by low-P diets, more so with high cholecalciferol intakes. However, Ca did not influence 1,25-dihydroxycholecalciferol levels in plasma

Keywords

CalciumPhosphorusCholecalciferolPhytateChick
Type
Digestion and Utilization of Inorganic Nutrients
Information
British Journal of Nutrition , Volume 66 , Issue 2 , September 1991 , pp. 251 - 259
Copyright
Copyright © The Nutrition Society 1991

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