Calcium bioavailability of different organic and inorganic dietary Ca sources (citrate, lactate, acetate, oyster-shell, eggshell, β-tri-Ca phosphate)
1997
Bao, S.F. | Windisch, W. | Kirchgessner, M.
SUMMARY: In a 2-week metabolic study with ⁴⁵Ca-labeled growing rats, each of six groups of 10 animals were fed restrictively a semisynthetic purified diet supplemented with calcium citrate, calcium lactate, calcium acetate, oyster-shell meal, eggshell meal or β-tri-Ca phosphate. The total dietary contents of Ca, P and Mg were uniformly 2.8, 5.3 and 0.65 g/kg. True absorption, intermediate utilization and bioavailability was uniform for Ca citrate, lactate and acetate (average: 98.6, 97.9 and 96.5%). Oyster-shell revealed only slightly lower values (97.7, 97.6 and 95.2%). Eggshell and β-tri-Ca phosphate were lower in bioavailability (93.8 and 92.0) because of a reduced true absorption (96.3 and 94.9%) and in the case of β-tri-Ca phosphate also due to a slightly reduced intermediate utilization (97.0%). In total, all tested Ca sources revealed an extremely high absorbability and utilizability. Thus, the chemical formulation of dietary Ca does not seem to be the primary factor of Ca bioavailability in practical diets.
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