Effects of dietary calcium and available phosphorus concentration on digesta PH and on the availability of calcium, iron, magnesium and zinc from the intestinal contents of meat chickens

Shafey T.M., Mcdonald M.W. and Dingle J.G. (1991) Effects of dietary calcium and available phosphorus concentration on digesta PH and on the availability of calcium, iron, magnesium and zinc from the intestinal contents of meat chickens. British Poultry Science, 32 1: 185-194. doi:10.1080/00071669108417339


Author Shafey T.M.
Mcdonald M.W.
Dingle J.G.
Title Effects of dietary calcium and available phosphorus concentration on digesta PH and on the availability of calcium, iron, magnesium and zinc from the intestinal contents of meat chickens
Journal name British Poultry Science   Check publisher's open access policy
ISSN 1466-1799
Publication date 1991-03-01
Sub-type Article (original research)
DOI 10.1080/00071669108417339
Volume 32
Issue 1
Start page 185
End page 194
Total pages 10
Subject 1103 Clinical Sciences
1106 Human Movement and Sports Science
Abstract 1. The effects of high calcium intakes on the pH and availability of calcium, iron, magnesium and zinc in the gastrointestinal tract (GIT) contents of meat chickens were studied in two experiments. 2. A high dietary concentration of calcium (25–3 vs 10–7 g/kg) increased the pH of crop and ileum contents, but did not influence the pH of the contents of other segments of the GIT. 3. The solubilities of minerals in GIT contents were reduced and the size of dissolved mineral complexes were increased as the digesta moved from the duodenum and jejunum to the ileum. 4. After feeding diets with calcium and available phosphorus concentrations (15–3 and 4–3 g vs 21-8 and 4–3 g vs 22–6 and 8–3 g/kg), centrifugation of GIT contents showed that most (70-92%) of the calcium, iron, magnesium and zinc was in an insoluble form. High calcium diets reduced the proportion of soluble zinc associated with small complexes, and high calcium and available phosphorus diets reduced the proportions of soluble magnesium and zinc associated with small complexes. 5. These findings explain the mechanism of the reduced availability of zinc and magnesium in high calcium and high available phosphorus diets.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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