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Influence of dietary potassium on the absorption of magnesium from herbage and dry diets by ruminants

Published online by Cambridge University Press:  05 November 2021

O. Adediji  and
N.F. Suttle
O. Adediji
Affiliation:
Moredun Research Institute, 408 Gilmerton Road, Edinburgh EH17 7JH
N.F. Suttle
Affiliation:
Moredun Research Institute, 408 Gilmerton Road, Edinburgh EH17 7JH
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Extract

A recent extensive review of the ‘bioavailability’ of magnesium (Mg) (Henry and Benz 1995) noted that the fractional efficiency of apparent absorption of Mg (AAMg) in ruminants could vary from -0.04 to +0.66. Little attempt was made to identify sources of variation, other than those between inorganic Mg supplements. Earlier, ARC (1980) had failed to find consistent differences between fresh herbage (FH) and dry diets but a reexamination of the literature suggested that AAMg was twice as high for mixtures of roughage and concentrate (R/C) as for FH and confirmed the marked inhibitory effect of dietary potassium (K) (Suttle, 1987). Since grass is usually richer in K than a dry diet, differences between diet types in AAMg may be largely attributable to differences in K concentration. The objective of the study was to identify systematic sources of variation in the absorbability of dietary magnesium (Mg) to sheep from published balance studies.

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Proceedings of the British Society of Animal Science , Volume 1998 , 1998 , pp. 219
Copyright
Copyright © The British Society of Animal Science 1998

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References

Agricultural Research Council (1980). In The nutrient requirements of ruminants. Commonwealth Agricultural Bureaux, Farnham Royal, UK pp201–211.Google Scholar
Henry, P.R. and Benz, S.A. (1995). Magnesium bioavailability In ‘Bioavailability of nutrients for animals’, Chapter 10. Edited by Ammerman, C.B., Baker, D.H., Academic Press, New York, pp201–237.CrossRefGoogle Scholar
Suttle, N.F. (1987). The absorption, retention and function of minor nutrients. In ‘The Nutrition of Herbivores.’ Edited by Ternouth, J.H. and Hacker, J.B.. Academic Press, Canberra, pp333-361.Google Scholar