Future Farmers of America (FFA) Vet Science Career Development Events (CDE) Practice Exam 2025 - Free Vet Science CDE Practice Questions and Study Guide

Grass tetany, also known as grass staggers, is primarily caused by a deficiency of magnesium in the diet of grazing livestock, particularly cattle. When animals consume lush pastures that are high in nitrogen and low in magnesium, their dietary intake of magnesium may not meet their physiological requirements. This is especially common during spring when rapid pasture growth occurs.

The symptoms of grass tetany include nervousness, muscle tremors, and in severe cases, convulsions and death. This condition is particularly critical because magnesium is essential for several metabolic processes, including the proper functioning of muscles and nerves. Cattle that are deficient in magnesium cannot adequately regulate their muscle contractions, leading to the clinical signs noted.

Understanding that grass tetany is primarily associated with magnesium deficiency helps in managing the nutritional needs of grazing animals, particularly during periods of rapid forage growth. This reinforces the importance of monitoring the mineral composition of pasture and providing appropriate supplementation to prevent such deficiencies. In contrast, while nitrogen and phosphorus are important nutrients, their overload or deficiency does not directly cause grass tetany.