The cows were found dead in a Stockton pasture two weeks ago. Locals were left scratching their heads about what caused the mass die-off.
Investigators from the University of Wisconsin have determined that the animals were killed by a poison found in spoiled sweet potatoes that were part of the cattle's feed.
"It is likely that a mycotoxin from moldy sweet potato was a major factor in the disease and deaths of these steers," said Peter Vanderloo, associate director of the Wisconsin Veterinary Diagnostic Laboratory.
There's been a spate of mass animal deaths in recent weeks, from fish in Maryland and Arkansas to birds in Louisiana and South Dakota.
Dead Cows Mystery Solved
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