Hypomagnesemia / Grass Tetany

21.3.1 Hypomagnesemia / Grass Tetany This is also known as “grass staggers.” It is seen in high producing dairy cows grazing on lush green grass or wheat pasture, particularly those fertilized with nitrogen and potash. This grass usually has a low magnesium content which may cause magnesium deficiency. Sometimes it is also associated with hypocalcemia in dairy cows that are pregnant.

Symptoms:

 similar to ketosis.

 staggering.

 the animal may fall down and thrash its legs frantically (i.e. tetany).

 muscle tremors.

Diagnosis:

 Based on symptoms and history (and knowledge that this is a problem in your area).

Treatment:

 Give IV a commercial mineral solution that contains both calcium and magnesium. (According to the instructions on the label.)

Prevention/Control:

 In areas where this is a problem, animals must be given extra magnesium in their diet. There are many ways to do this, such as feeding magnesium oxide or mixed magnesium compounds. Consult with a local veterinary officer.