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Magnesium metabolism in lactating goats fed on grass diets differing in mineral content

Published online by Cambridge University Press:  27 March 2009

C. L. Johnson  and
G. Powley
C. L. Johnson
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT, UK
G. Powley
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT, UK
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Summary

A balance experiment was carried out using four young lactating goats in a Latin square design, fed with perennial ryegrass (Lolium perenne) from plots that had received 377 kg K/ha (diet 1); 63 kg K plus 377 kg Na/ha (diet 2); 188 kg K plus 188 kg Na/ha (diet 3) or no fertilizer (control diet 4).

The apparent availability of Mg was high in all the grass diets (0·355–0·469); it was significantly depressed (P < 0·05) when the intake of K was high (diet 1); but was not significantly different when a high intake of K was accompanied by a high intake of Na (diet 3).

There was a significantly lower (P < 0·05) apparent availability of Na in diet 4 and a significantly higher (P < 0·05) apparent availability of K in diet 3. There were no significant differences in the apparent availability of Ca.

The plasma Mg concentration was not significantly affected by any dietary treatment but did decrease temporarily when diets were changed.

There were no significant effects on mineral concentrations in the milk.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 2 , April 1990 , pp. 133 - 138
Copyright
Copyright © Cambridge University Press 1990

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References

REFERENCES

Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock, 2nd edn.Slough: Commonwealth Agricultural Bureaux.Google Scholar
Allsop, T. F. & Rook, J. A. F. (1979). The effect of diet and blood-plasma magnesium concentration on endogenous faecal loss of magnesium in sheep. Journal of Agricultural Science, Cambridge 92, 403–408.CrossRefGoogle Scholar
Brown, R. C. (1980). Studies on the absorption of magnesium from the rumen of sheep. PhD thesis, University of Leeds.Google Scholar
Care, A. D., Brown, 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
Care, A. D., Vowles, L. E., Mann, S. O. & Ross, D. B. (1967). Factors affecting magnesium absorption in relation to the aetiology of acute hypomagnesaemia. Journal of Agricultural Science, Cambridge 68, 195–204.CrossRefGoogle Scholar
Dittmer, D. S. (1961). Biological Handbooks: Blood and Other Body Fluids. Washington, D.C.: Federation of American Societies for Experimental Biology.Google Scholar
Field, A. C. & Suttle, N. F. (1979). Effects of high potassium and low magnesium intakes on the mineral metabolism of monozygotic twin cows. Journal of Comparative Pathology 89, 431–439.CrossRefGoogle ScholarPubMed
Grace, N. D., Caple, I. W. & Care, A. D. (1988). Studies in sheep on the absorption of magnesium from a low molecular weight fraction of the reticulo-rumen contents. British Journal of Nutrition 59, 93–108.CrossRefGoogle ScholarPubMed
Grant, S. A., Bolton, G. R. & Russel, A. J. F. (1984). The utilization of sown and indigenous plant species by sheep and goats grazing hill pastures. Grass and Forage Science 39, 361–370.CrossRefGoogle Scholar
Hemingway, R. G., Ritchie, N. S., Rutherford, A. R. & Jolly, G. M. (1963). Effects of potassium fertilizers, age of ewe and small magnesium supplements on blood magnesium and calcium levels in lactating ewes. Journal of Agricultural Science, Cambridge 60, 307–313.CrossRefGoogle Scholar
Johnson, C. L. & Aubrey-Jones, D. A. (1989). Effect of change of diet on the mineral composition of rumen fluid, on magnesium metabolism and on water balance in sheep. British Journal of Nutrition 61, 583–594.CrossRefGoogle ScholarPubMed
Johnson, C. L., Helliwell, S. H. & Aubrey-Jones, D. A. (1988). Magnesium metabolism in the rumens of lactating dairy cows fed on spring grass. Quarterly Journal of Experimental Physiology 73, 23–31.CrossRefGoogle ScholarPubMed
National Research Council (1981). Nutrient Requirements for Goats. Washington, D.C.: National Academic Press.Google Scholar
Newton, G. L., Fontenot, J. P., Tucker, R. E. & Polan, C. E. (1972). Effects of high dietary potassium intake on metabolism of magnesium by sheep. Journal of Animal Science 35, 440–445.CrossRefGoogle ScholarPubMed
Powley, G., Care, A. D. & Johnson, C. L. (1977). Comparison of daily endogenous faecal magnesium excretion from sheep eating grass with high sodium or high potassium concentrations. Research in Veterinary Science 23, 43–46.CrossRefGoogle ScholarPubMed
Suttle, N. F. & Field, A. C. (1967). Studies on magnesium in ruminant nutrition. 8. Effect of increased intakes of potassium and water on the metabolism of magnesium, phosphorus, sodium, potassium and calcium in sheep. British Journal of Nutrition 21, 819–831.CrossRefGoogle Scholar
Tomas, F. M. & Potter, B. J. (1976). The site of magnesium absorption from the ruminant stomach. British Journal of Nutrition 36, 37–45.CrossRefGoogle ScholarPubMed
Wilkinson, J. M. & Stark, B. A. (1987). Commercial Goat Production. Oxford: B.S.P. Professional Books.Google Scholar
Wilson, A. A. (1960). Magnesium homeostasis and hypomagnesaemia in ruminants. Veterinary Reviews and Annotations 6, 39–52.Google Scholar
Wylie, M. J., Fontenot, J. P. & Green, L. W. (1985). Absorption of magnesium and other macromolecules in sheep infused with potassium in different parts of the digestive tract. Journal of Animal Science 61, 1219–1229.CrossRefGoogle Scholar