[Grass tetany in cattle].

An optimal magnesium supply of dairy cows during pasture period is still a pressing problem in our farms and husbandry. Experiences are described concerning the application of different magnesium concentrated preparations in cases of grass tetany in 1970 to 1975 in the district of Potsdam. In 224 cows with magnesium concentrations values in the serum below 1.8 mg/100 ml a 25% MgSO4-solution, Parevert and Vers. A, a test solution of VEB Tierarzneimittelwerk Leipzig are used as a metaphylactic treatment. Losses by grass tetany could be reduced after application of the named preparations. Also in cases of low dosage a further, at least temporary drop of magnesium values in the serum could be prevented. Metaphylactic measures are recommended for andangered herds.