Lactating cows eating forages that predispose them to grass tetany must be supplemented with a mineral mixture that contains high concentration (8-10 percent) of magnesium, usually magnesium oxide. There is evidence that high intakes of potassium can interact with Mg uptake, so check the mineral for K(potassium) also.
FAQ #3507
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How can I prevent grass tetany (Hypomagnesemia) from affecting my herd?
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