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Hypophosphatemia Induced by Dietary Aluminium Hydroxide Supplementation in Growing Pigs: Effects on Erythrocytes, Myocardium, Skeletal Muscle and Liver

Abstract

Three groups of pigs were studied during and after 10 weeks of treatment with either Al(OH)3 (Al[OH]3-group, n=8) to induce hypophosphatemia, A1P04 (AlP04-group, n=8, aluminium control without hypophosphatemia) or no addition to the feed (control group, n=8). Blood samples were taken at the start of the experiment and after 3, 6 and 10 weeks and were analyzed for phosphate, calcium and 2,3-diphosphoglycerate (2,3-DPG). Samples from myocardium, skeletal muscle and liver were obtained in connection with exsanguination and analyzed for glycogen, adenosine-tri-phosphate (ATP), creatine phosphate (CP), glucose-6-phosphate (G-6-P) and lactate. The Al(OH)3-group became hypophosphatemic and hypercalcémie with low levels of 2,3-DPG in erythrocytes within 3 weeks and showed a retarded growth rate. After 10 weeks the Al(OH)3-group had low levels of ATP in myocardium as compared with the control-group and low levels of G-6-P as compared with the AlP04-group. No disturbances on electro-cardiograms registered at rest could be documented. G-6-P concentration was low in the biceps muscle in the Al(OH)3-group as compared with the AlP04-group and in the liver low G-6-P concentration was seen in addition to high lactate concentration. The fibre type composition in M. Longissimus did not differ between groups, but the Al(OH)3-group had, due to retardation in growth, smaller mean fibre-areas than pigs in the AlP04-group. Hypophosphatemia gave rise to high serum calcium levels, low concentration of 2,3-DPG in erythrocytes and influenced G-6-P concentration in skeletal muscle, G-6-P and ATP in myocardium, G-6-P and lactate in liver. Retarded growth was one serious consequence of hypophosphatemia and the disturbed energy metabolism.

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Acknowledgments

This work was supported by grants from the Swedish Council for Forestry and Agricultural Research (SJFR), the Swedish Medical Research Council (nr 5992) and the Karolinska Institute.

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Håglin, L., Essén-Gustavsson, B. & Lindholm, A. Hypophosphatemia Induced by Dietary Aluminium Hydroxide Supplementation in Growing Pigs: Effects on Erythrocytes, Myocardium, Skeletal Muscle and Liver. Acta Vet Scand 35, 263–271 (1994). https://doi.org/10.1186/BF03548331

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