News Update
April 24, 2006
Spring Supplements Protect Against Grass Tetany
This spring’s cool, wet weather could jeopardize the health of grazing animals as temperatures warm up and grasses begin to grow vigorously.
Glenn Shewmaker, University of Idaho Extension forage specialist, advises that livestock producers begin providing supplemental minerals immediately to protect their cattle from grass tetany. Grass tetany — a neurological disorder initially marked by nervousness, unusual alertness and staggering — is a nutritional problem prompted by shortages of magnesium (Mg). Magnesium concentration in grass can fall below recommended levels when grasses grow too lush.
By the time many livestock owners see the disorder’s most obvious symptoms — muscle spasms or convulsions in downed animals — it’s often too late to save the victims. “The best approach is a preventative one,” Shewmaker says.
Grass tetany occurs most commonly in animals grazing seeded rangelands and irrigated pastures, particularly those planted only with grasses. Diets of strictly crested wheatgrass or winter wheat are especially “notorious,” Shewmaker says. Pasture mixes that include legumes or a wide variety of forage species offer significant protection, as does supplemental hay. Lactating older cows are at highest risk.
Trace-mineral mixes do not provide enough magnesium to protect against grass tetany, Shewmaker says. Because it can take several weeks for livestock to accept the supplements, he advises producers to start offering a salt/mineral mix right away.
— Adapted from a press release from the University of Idaho
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