Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-24T23:02:25.718Z Has data issue: false hasContentIssue false
  • English
  • Français

Magnesium phosphates as dietary supplements for growing sheep

Published online by Cambridge University Press:  27 March 2009

G. Fishwick  and
R. G. Hemingway
G. Fishwick
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
R. G. Hemingway
Affiliation:
Glasgow University Veterinary School, Bearsden, Glasgow
Get access Rights & Permissions [Opens in a new window]

Summary

Growing wether sheep in metabolism cages were fed a low phosphorus diet (0·75g P/day) supplemented with 1·75 g P/day as either a magnesium phosphate (20·0% Mg, 18·5% P) or a calcium magnesium phosphate (16·1% Ca, 6·0% Mg, 18·5% P). In addition, the magnesium phosphate provided 1·87 g Mg/day and the calcium magnesium phosphate 0·57 g Mg/day. In each case comparisons were made with equivalent amounts of phosphorus and magnesium supplied as dicalcium phosphate (26·5% Ca, 16·0% P) and magnesium oxide (60·0% Mg).

All the supplements resulted in similar positive phosphorus retentions of between 0·77and 0·92 g P/day compared with a daily loss of 0·17 g P/day for the low phosphorus diet. Calcium retentions were higher (1·40 and 1·70 g Ca/day) whendicalcium phosphate rather than the magnesium phosphates (1·16 g Ca/day) were given. Magnesium retentions were increased from 0·1 g Mg/day (unsupplemented) to 0·3–0·4 gMg/day and were similar for both magnesium oxide and the magnesium phosphates.

Blood phosphorus and magnesium concentrations were increased to a similar degree by all forms of supplementation.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 81 , Issue 3 , December 1973 , pp. 441 - 444
Copyright
Copyright © Cambridge University Press 1973

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Agricultural Research Council. (1965). TheNutrient Requirements of Farm Livestock, no. 2. London: H.M.S.O.Google Scholar
Cavell, A. J. (1955). The colorimetric determination of phosphorus in plant materials. J. Sci. Fd Agric. 6, 479–80.Google Scholar
Fishwick, G. (1973). A simplified method for the collection of faeces in digestibility trials with sheep. J. Sci. Fd Agric. 24, 105–6.CrossRefGoogle ScholarPubMed
Hemingway, R. G. (1971). Minerals in the nutrition of hill cattle and sheep. Proc. Nutr. Soc. 30, 221–9.CrossRefGoogle ScholarPubMed
Hemingway, R. G. & Brown, Nora A. (1967). Magnesium ammonium phosphate as a mineral supplement for growing lambs. Proc. Nutr. Soc. 26, xvi.Google Scholar
Hemingway, R. G., MacPherson, A., Duthie, A. K. & Brown, N. A. (1968). The mineral composition of hay and silage grown in Scotland in relation to the A.R.C. standards for the mineral requirements of dairy cattle. J. agric. Sci., Camb. 71, 53–9.CrossRefGoogle Scholar
Huffman, C. F., Conley, C. L., Lightfoot, C. C. & Duncan, C. W. (1941). Magnesium studies in calves. II. The effect of magnesium salts and various natural feeds upon the magnesium content of the blood plasma. J. Nutr. 22, 609–20.CrossRefGoogle Scholar
Rook, J. A. F., Balch, C. C. & Line, C. (1958). Magnesium metabolism in the dairy cow. I. Metabolism on stall rations. J. agric. Sci., Camb. 51, 189–98.CrossRefGoogle Scholar
Suttle, N. F. & Field, A. C. (1966). Effect of water intake on the metabolism of magnesium in the sheep. Proc. Nutr. Soc. 25, xxi–xxii.Google Scholar