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The effect of ruminal phosphate concentration on the absorption of calcium, phosphorus and magnesium from the reticulo-rumen of the sheep

Published online by Cambridge University Press:  09 March 2007

L. J. Beardsworth ,
P. M. Beardsworth  and
A. D. Care
L. J. Beardsworth
Affiliation:
Department of Animal Physiology & Nutrition, University of Leeds, Leeds LS2 9JT
P. M. Beardsworth
Affiliation:
Department of Animal Physiology & Nutrition, University of Leeds, Leeds LS2 9JT
A. D. Care
Affiliation:
Department of Animal Physiology & Nutrition, University of Leeds, Leeds LS2 9JT
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Abstract

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1. The absorption rates of calcium, inorganic phosphate (P1) and magnesium were determined from buffered solutions placed in the temporarily isolated and washed reticulo-rumen of conscious sheep. The basic composition of these solutions was similar to that found in supernatant fractions of ultracentrifuged rumen contents.

2. The Pi concentrations studied in these solutions were 2, 8·7, 14, 17·3 and 38 mmol/l. The initial concentration of Ca was 2·0 mmol/l and that of Mg was 2.5 mmol/l in all experiments.

3. Increasing the Pi concentration in the rumen solution from 2 to 38 mmol/l resulted in increases in the net absorption rates of both Ca and Pi, and a decrease in the potential difference across the wall of the rumen.

4. Similarly, increasing the Pi concentration from 2 to 17·3 mmol/l resulted in an increase in the net absorption rate of Mg from the rumen.

5. Mineral analysis of strained rumen fluid or a 30000 g centrifugate of strained rumen fluid revealed a reduced Pi concentration in sheep fed on frozen spring grass as opposed to the pellet + hay diet. The values obtained were within the range studied.

Type
Rumen Physiology
Information
British Journal of Nutrition , Volume 61 , Issue 3 , May 1989 , pp. 715 - 723
Copyright
Copyright © The Nutrition Society 1989

References

Axford, R. F. E., Hughes, A. & Evans, R. A. (1982)Magnesium ammonium phosphate precipitation and its significance in sheep. Proceedings of the Nutrition Society 41, 85A.Google Scholar
Beardsworth, L. J., Beardsworth, P. M. & Care, A. D. (1987)The effect of increased potassium concentration on the absorption of magnesium from the reticulo-rumen of conscious sheep. Journal of Physiology 386, 89P.Google Scholar
Breves, G., Gabel, G., Martens, H. & Holler, H. (1986)Phosphate fluxes across the rumen wall mucosa of sheep in vitro. Proceedings of the Nutrition Society 45, 99A.Google Scholar
Breves, G. & Holler, H. (1986)Nettoresorption von anorganischem phosphat aus dem Pansen von Schafen. Journal of Animal Physiology and Nutrition 56, 159.Google Scholar
Breves, G., Holler, P., Packheiser, P., Gabel, G. & Martens, H. (1988)Flux of inorganic phosphate across the sheep rumen wall in vivo and in vitro. Quarterly Journal of Experimental Physiology 73, 343–351.CrossRefGoogle ScholarPubMed
Breves, G., Rosenhagen, C. & Holler, H. (1987)Die Sekretion von anorganischem Phosphor mit dem Speichel bei P-depleterton Schafen. Zentralblatt für Veterinär-Medizin 34, 42–47.Google Scholar
Care, A. D., Brow, R. C., Farrar, A. R. & Pickard, D. W. (1984)Magnesium absorption from the digestive tract of sheep. Quarterly Journal of Experimental Physiology 69, 577–587.CrossRefGoogle ScholarPubMed
Dobson, A. (1959)Active transport through the epithelium of the reticulo-rumen sac. Journal of Physiology 146, 235–251.CrossRefGoogle ScholarPubMed
Dobson, A., Sellers, S. F. & Gatewood, V. H. (1976)Dependence of CrEDTA absorption from the rumen on luminal osmotic pressure. American Journal of Physiology 231, 1595–1600.CrossRefGoogle ScholarPubMed
Downes, A. M. & McDonald, I. W. (1964)The chromium-51 complex of ethylenediamine tetraacetic acid as a soluble rumen marker. British Journal of Nutrition 18, 153–162.CrossRefGoogle ScholarPubMed
Edrise, B. M. & Smith, R. H. (1986)Exchanges of magnesium and phosphorus at different sites in the ruminant stomach. Archives of Animal Nutrition, Berlin 36, 1019–1027.Google ScholarPubMed
Grace, N. D., Caple, I. W. & Care, A. D. (1988)Studies in sheep on the absorption of magnesium from a lowmolecular-weight fraction of the reticulo-rumen contents. British Journal of Nutrition 59, 93–108.CrossRefGoogle Scholar
Grings, E. E. & Males, J. R. (1987)Effects of potassium macromineral absorption in sheep fed wheat straw-based diets. Journal of Animal Science 64, 872–879.CrossRefGoogle ScholarPubMed
Hemingway, R. G. & Ritchie, N. S. (1965)The importance of hypocalcaemia in the development of hypomagnesaemic tetany. Proceedings of the Nutrition Society 24, 54.CrossRefGoogle ScholarPubMed
Martens, H. & Rayssiguier, Y. (1980) Magnesium metabolism and hypomagnesaemia. In 5th International Symposium on Ruminant Physiology, pp. 447–466 [Ruckebusch, Y. and Thivend, P., editors]. Lancaster: MTP Press.Google Scholar
Parthasarathy, D., Garton, G. A. & Phillipson, A. T. (1952) The passage of phosphorus across the rumen epithelium of sheep. British Journal of Nutrition 52, xvi–xvii.Google ScholarPubMed
Ritchie, N. S. & Fishwick, G. (1977)Magnesium phosphate as a dietary supplement for lactating cows at spring pasture. Journal of Agricultural Science, Cambridge 88, 71–73.CrossRefGoogle Scholar
Scarisbrick, R. & Ewer, T. K. (1951) The absorption of inorganic phosphate from the rumen of sheep. Biochemical Journal 49, xxix.Google Scholar
Scott, D. & Buchan, W. (1987)The effects of feeding either hay or grass diets on salivary phosphorus secretion, net intestinal phosphorus absorption and on the partition of phosphorus excretion between urine and faeces in the sheep. Quarterly Journal of Experimental Physiology 72, 331–333.CrossRefGoogle ScholarPubMed
Simesen, M. G. (1970) Calcium, inorganic phosphorus and magnesium metabolism in health and disease. In The Clinical Biochemistry of Domestic Animals pp. 313–375 [Kaneko, J.J and Cornelius, C. E., editors]. New York: Academic Press.CrossRefGoogle Scholar
Sperber, I. & Hydén, S. (1952)Transport of chloride through the ruminal mucosa. Nature 169, 587.CrossRefGoogle ScholarPubMed
Walling, M. W. (1977) Intestinal Ca and phosphate transport: differential responses to vitamin D3 metabolites. American Journal of Physiology 233, E488–E494.Google ScholarPubMed
Wright, E. (1955)Site of phosphorus absorption in the sheep. Nature 176, 351–352.Google ScholarPubMed