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Metabolism and requirements for calcium and phosphorus in the fast-growing chicken as affected by age

Published online by Cambridge University Press:  09 March 2007

Arie Bar ,
Dmitry Shinder ,
Sara Yosefi ,
Eliaho Vax  and
Isaac Plavnik
Arie Bar*
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel
Dmitry Shinder
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel
Sara Yosefi
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel
Eliaho Vax
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel
Isaac Plavnik
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel
*
*Corresponding author: Dr Arie Bar, fax +972 8 9475075, email [email protected]
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Abstract

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Three series of experiments were conducted with fast-growing chickens in order: to evaluate the effects of dietary Ca and P on cholecalciferol metabolism and expression; to determine dietary Ca requirements; to determine dietary P requirements. The results of the first series confirmed previous results on the effects of dietary Ca and P on some variables of vitamin D metabolism and expression, Ca homeostasis and P metabolism in the young chicken (1- to 21-d-old), and extended them to older birds (22- to 43-d-old). The bone formation rate and the duodenal calbindin content were maintained at high levels until the age of 43 d. Dietary Ca or P restriction increased duodenal calbindin and decreased bone ash in both 22- and 43-d-old chickens, but the effect on bone ash was less pronounced in the 43-d-old birds than in the younger ones. These results suggest that: (a) the capabilities for adaptation to dietary Ca and P restriction remain high during the whole growing period; (b) the growing broilers express a high adaptive capability even when the diet contains the recommended Ca and P contents. The results of the second and third series of experiments suggest that: (c) unlike the Ca requirements of the 1- to 22-d-old chick, P requirements for growth and bone ash are similar, and are as high in the older chicks as in the younger ones (7·4–8·3 g P/kg or 4·8–5·7 g non-phytate P/kg diet); (d) although growth and bone ash in the 29- to 43-d-old chickens appear to be less sensitive to dietary Ca content, within a range close to the calculated P requirement, 10 g Ca/kg diet appears to be required for best tibia mineralization, and to a lesser extent for better growth at this age.

Keywords

BoneGrowthCalbindinCholecalciferol1-Hydroxylase
Type
Research Article
Information
British Journal of Nutrition , Volume 89 , Issue 1 , January 2003 , pp. 51 - 60
Copyright
Copyright © The Nutrition Society 2003

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