This is a metabolic disorder caused by low blood magnesium. Symptoms include lack of coordination, nervousness, muscle spasm and staggering in cattle. In severe cases death can occur. It generally occurs when older, nursing cows that are placed on lush, immature grasses. Some ways to reduce the incidence of grass tetany include:
• Holding cattle off new pasture until it is 4-6 inches high
• Feed dry hay or grain to cattle on new pasture
• Graze less susceptible animals on high risk pastures (steers, heifers and dry cows)