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Phosphorus absorption, and phosphorus and calcium kinetics in sheeps fed with different phosphates



Phosphorus absorption, and phosphorus and calcium kinetics in sheeps fed with different phosphates



Interciencia 30(7): 414-418



In order to measure true absorption of P, and P and Ca kinetics, four sheep per phosphorus source, with different tissue "pool sizes" of fluorine, were fed during a 15 month period sedimentary phosphates of Riecito (RIO) and Monte Fresco (MONTE), and triple superphosphate fertilizer (TSP) to constitute the high F tissue pool group. In addition, four animals with low F tissue pool were fed during the last 30 days of the experiment with dicalcium phosphate (DICAL) plus 500 ppm F (D+F). A reference group was fed DICAL alone. Sheep were kept in metabolic crates. The diets (1kg/animal/day) had similar protein, caloric, P and Ca contents. P and Ca kinetics, and endogenous faecal P fraction were determined by isotopic dilution technique with (32)P and (45)Ca (200 mu Ci/animal). True absorption of P showed higher values (P < 0.05) for DICAL, D+F and TSP and lower ones for RIO and MONTE. The half-life of fast (32)P blood clearance was lower for TSP, DICAL and D+F in relation to RIO and MONTE. The t1/2 for (45)Ca entry to plasma was lower for DICAL, intermediate for TSP and D+F and higher for RIO and MONTE. The t1/2 for 45 Ca clearance was significantly lower (P < 0.05) for DICAL, followed by RIO, DICAL+F, MONTE and TSP Capture of (32)P and (45)Ca in bone tissue was higher in less mineralized bone. The results indicate that P bioavailability is lower in sedimentary phosphates; that P kinetics is related to the bioavailability of the element; and that high levels of F independent of tissue pool, have a negative effect on Ca absorption, with no apparent effect on P utilization.

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