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Influence of manufacturing conditions on the bioavailability of magnesium in calcined magnesites measured in vivo and in vitro

Published online by Cambridge University Press:  27 March 2009

C. L. Adam ,
R. G. Hemingway  and
N. S. Ritchie
C. L. Adam
Affiliation:
Department of Veterinary Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH, UK
R. G. Hemingway
Affiliation:
Department of Veterinary Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH, UK
N. S. Ritchie
Affiliation:
Department of Veterinary Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH, UK
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Summary

Dietary calcined magnesite supplements of different particle sizes and temperatures of calcination were examined at Glasgow University Veterinary School in 1981. Balance experiments with wether sheep revealed that particle sizes < 75, 75–150, 150–250 and 500–1000 μm diameter of a feed-grade calcined magnesite all increased urinary output of magnesium to a similar extent but the apparent magnesium availability coefficient for the 500–1000 μm diameter fraction (0·03) was significantly less than for fractions of smaller diameter (0·17–0·23) (P < 0·01). A 1000–2000 μm fraction of fertilizer-grade material had an apparent availability of 0·18 but had the least effect on urinary magnesium output. Calcination temperatures of 800, 900 and 1100 °C significantly increased apparent availability (c. 0·46)compared with that for temperatures of 500 and 650 °C (c. 0·12) (P < 0·01), and significantly increased urinary output of magnesium. Losses of magnesium from these supplements incubated in the rumen of cows at grass in 24 μm mesh nylon bags showed some correlations with their apparent availability and urinary magnesium output. Solubility in molar ammonium nitrate showed some good correlations with urinary magnesium output but not with magnesium availability. Supplementation of a low magnesium diet given to lactating ewes with fine particle (< 75μm) calcined magnesite resulted in significantly greater increases in plasma magnesium concentration than when coarse particle material (500–1000 μm) was given (P < 0·05), but magnesites calcined at 650 and 800 °C induced similar changes in plasma magnesium.

Type
Animals
Information
The Journal of Agricultural Science , Volume 127 , Issue 3 , November 1996 , pp. 377 - 385
Copyright
Copyright © Cambridge University Press 1996

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References

REFERENCES

Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Slough: Commonwealth Agricultural Bureaux.Google Scholar
Durrant, M. J. & Draycott, A. P. (1976). Improvements in calcined magnesite as a magnesium fertilizer. Journal of Agricultural Science, Cambridge 86, 543–552.CrossRefGoogle Scholar
Fishwick, G. & Hemingway, R. G. (1973). Magnesium phosphates as dietary supplements for growing sheep. Journal of Agricultural Science, Cambridge 81, 441–444.CrossRefGoogle Scholar
Jesse, B. W., Thomas, J. W. & Emery, R. S. (1981). Availability of magnesium from magnesium oxide particles of differing sizes and surfaces. Journal of Dairy Science 64, 197–205.CrossRefGoogle Scholar
Perkin-Elmer, (1976). Analytical Methods for Atomic Absorption Spectroscopy. Norwalk, CT: Perkin-Elmer Corporation.Google Scholar
Ritchie, N. S. & Hemingway, R. G. (1963). Failure of lactating ewes with low plasma magnesium values to respond to large daily magnesium supplements. Journal of Agricultural Science, Cambridge 60, 305–306.CrossRefGoogle Scholar
Rook, J. A. F. & Storry, J. E. (1962). Magnesium in the nutrition of farm animals. Nutrition Abstracts and Reviews 32, 1055–1077.Google ScholarPubMed
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
van Ravenswaay, R. O., Henry, P. R., Ammerman, C. B. & Littell, R. C. (1992). Relative bioavailability of magnesium sources for ruminants as measured by urinary magnesium excretion. Animal Feed Science and Technology 39, 13–26.CrossRefGoogle Scholar
Zervas, G. & Papadopoulos, G. (1993). The bioavailability of magnesium from different types of calcined magnesites of Greek origin. Animal Production 56, 351–358.Google Scholar