Changes in metabolism of acellular bone in tilapia, Oreochromis niloticus, during deficiency and subsequent repletion of calcium

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Abstract 1. 1. Young tilapia, Oreochromis niloticus, were reared under calcium-deficient condition for 20 days and then transferred to normal condition and reared for 14 days. Changes in bone metabolism were studied by histomorphometry of the pharyngeal bone and measurements of calcium and phosphate contents of the opercular bone. 2. 2. Calcium deficiency activated bone resorption and decreased bone calcium and phosphate contents. 3. 3. Subsequent repletion of calcium markedly activated bone formation and suppressed bone resorption. The decreased contents of calcium and phosphate recovered to the control level. 4. 4. Results indicated that repletion of calcium restored the changes in bone metabolism induced by calcium deficiency.

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