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The effects of magnesium compounds and of fertilizers on the mineral composition of herbage and on the incidence of hypomagnesaemia in dairy cows

Published online by Cambridge University Press:  27 March 2009

S. McConaghy ,
J. S. V. McAllister ,
J. R. Todd ,
J. E. F. Rankin  and
J. Kerr
S. McConaghy
Affiliation:
Chemical Research Division, Ministry of Agriculture, Northern Ireland and Queen's University, Belfast
J. S. V. McAllister
Affiliation:
Chemical Research Division, Ministry of Agriculture, Northern Ireland and Queen's University, Belfast
J. R. Todd
Affiliation:
Veterinary Research Division, Ministry of Agriculture, Northern Ireland
J. E. F. Rankin
Affiliation:
Veterinary Research Division, Ministry of Agriculture, Northern Ireland
J. Kerr
Affiliation:
Agricultural Research Institute, Hillsborough, Northern Ireland
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Extract

1. An experiment, lasting 3 years, was carried out to investigate the control of hypomagnesaemia on a medium-heavy loam soil in Northern Ireland, using as criteria herbage analysis and analysis of blood sera of grazing dairy cows.

2. Applications of calcined magnesite and magnesian limestone as soil treatments raised the magnesium contents of herbage slightly but not to levels judged to be safe. Low blood sorum magnesium levels were recorded for cows grazing this herbage although no cases of tetany occurred.

3. Magnesium sulphate, appliedas a spray, temporarily raised the ‘apparent’ magnesium content of the herbage but was easily washed off by rain.

4. Finely powdered calcined magnesite applied as a dust to the herbage immediately before grazing appeared to be a promising method of control under Northern Ireland conditions.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 60 , Issue 3 , May 1963 , pp. 313 - 328
Copyright
Copyright © Cambridge University Press 1963

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References

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