Hypomagnesaemia in milking cows: the response of serum magnesium to alterations in herbage composition resulting from potash and nitrogen dressing on pasture.

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Abstract
Detailed results presented in this paper were obtained during an experiment reported previously (D.S.A. 21 [872]) and concern relationships between fertilizer treatment of pasture, chemical composition of the herbage and serum Mg levels. A heavy potash dressing caused increases in herbage K and decreases of 15-20% in the Mg level, while a heavy N application increased crude protein and Mg levels in the herbage. There was a significant correlation between serum Mg levels and Mg contents of the herbage in the week preceding blood sampling; in 822 cows no low serum Mg levels were found when the Mg content of the herbage was >0.20%. Negative correlations between serum Mg levels and crude protein or K content were significant. There was no relationship between daily milk yield and serum Mg levels. M.P.H. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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