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Grass tetany can be a serious and even fatal problem for different types of livestock. Understanding and recognizing the condition, however, can help you keep your animals healthy and prevent grass tetany from taking a toll on your livestock. About Grass Tetany Grass tetany is a magnesium deficiency in an animal’s blood and is often more common in lactating females or older animals that have more difficulty absorbing magnesium. Ruminants are susceptible to grass tetany, including cattle, sheep, and goats, and the disease is most common in spring and fall when pasture may not have as much new growth rich...