Calcium tolerance of growing chickens: effect of ratio of dietary calcium to available phosphorus

Excess calcium intake has been shown to reduce growth and feed efficiency and to increase bone ash and bone strength in growing chickens. Source and level of dietary phosphorus have been shown to affect calcium tolerance. The effects of high calcium can be largely explained by its effects on intesti...

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Bibliographic Details
Published in:World's poultry science journal 1993-03, Vol.49 (1), p.5-18
Main Author: Shafey, T.M.
Format: Article
Language:English
Subjects:
animal performance
Available phosphorus
bioavailability
bone
broiler chickens
calcium
chickens
dietary minerals
growth
homeostasis
intestines
literature reviews
nutrient requirements
nutrient retention
phosphorus
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Summary:Excess calcium intake has been shown to reduce growth and feed efficiency and to increase bone ash and bone strength in growing chickens. Source and level of dietary phosphorus have been shown to affect calcium tolerance. The effects of high calcium can be largely explained by its effects on intestinal pH. The proposed mechanism involves excess calcium reducing the soluble fraction of minerals and the proportion of minerals in small complexes. In consequence, their availability for absorption is probably also reduced. The growth depression of chickens fed on diets high in calcium may be partly caused by the decreased availability of other minerals needed for growth. Calcium tolerance of growing chickens may be increased by ensuring that there are higher than normal levels of the other required minerals in the diet.
ISSN:0043-9339
1743-4777
DOI:10.1079/WPS19930002