Food & Nutrition

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Arab Journal of Food & Nutrition tannins in thyme. The study results suggest that thyme tannins caused initial-stage of iron-deficiency in rats, which was compensated by increase in iron absorption. 230 Volume 11, No. 25, 2011 231
Arab Journal of Food & Nutrition 67. Study of Calcium Bioavailability of Different Local Food Sources in Rats as Compared with That of Milk Calcium (2003) Suzan Attiya Al-Banna\ University of Jordan Supervisor: Dr. Hamed R. Takruri This study was conducted to assess the bioavailability of calcium from different local food sources having different calcium / phosphorus ratios including sesame seeds, black cumin seeds, decorticated sesame seeds, fenugreek seeds, almond, garden rocket, mint, Swiss chard and mallow. The bioavailability of calcium was studied by the total collection method using Sprague-Dawley rats. Absorption and tissue concentration of calcium were determined as response parameters for the bioavailability. Five young growing Sprague-Dawley rats of both sexes (3F: 2M) were sacrified at the beginning of the experiment to determine the initial concentrations of calcium in serum and femur. Another fifty-five rats were divided into eleven groups. Each group, constituting of five rats, was fed a diet containing one of the studied foods as a source of calcium for four weeks. The results showed that the average weight gain and feed efficiency ratio were the highest (p0.05), except for Swiss chard and mint groups. Calcium utilization, as indicated by femur content, the highest was for the animals fed milk (p0.05). There were no significant differences in serum calcium among rats fed different food sources. A significant positive correlation coefficient was obtained between calcium / phosphorus ratios and total absorption (r = 0.75, p = 0.02). It is concluded that calcium bioavailability was the best from milk followed by black cumin and almond. Also, it was observed that different Ca/P ratios of the foods studied had a positive influence on total absorption of calcium but not on the percentage of its absorption. 232 Volume 231 11, No. 25, 2011
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