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Dietary zinc improves and calcium depresses growth and zinc uptake in rats fed rice bran |
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| Authors: | Semí ramis M. A. Domene, Hilda R. Torin,Jaime Amaya-Farf n |
| Affiliation: | a Faculty of Medical Sciences, Department of Food and Food Techniques, PUCCAMP, Campinas, SP, Brazil b Institute for Experimental Biology, Department of Nutritional Biochemistry, Universidad Central de Venezuela, Caracas, Venezuela c Department Food & Nutrition Planning, Faculty of Food Engineering, State University of Campinas, Campinas, SP, Brazil |
| Abstract: | Wistar rats were fed a basal stabilized-rice bran diet (B), and five additional ones, fortified to supply either 50 or 100% of zinc and calcium requirements, and a combination furnishing 100% of both minerals. Another diet supplemented with the complete mineral mix (MM) was also used. Results show that the low feed efficiency of B was maximized either by supplementation with MM, or by supplementing bran with 50% of the zinc requirement. Attempts to compensate for the low calcium content of bran by supplementation with 50 or 100% of the mineral requirement, did not increase either feed efficiency, growth or liver zinc. These data confirm that only about 11% of zinc contained in bran is nutritionally available and that supplementing with calcium is detrimental, indicating that this by-product is not a recommendable source of minerals. |
| Keywords: | Zinc Calcium Phytate Rice bran |
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