Even investors and criminals are turning their attention to one of the strangest moneymakers in agriculture. Think the price of beef is high? You should see the cost of cattle gallstones.

HOUSTON — It was an eventful opening day at the Houston Livestock Show and Rodeo. A cow got loose at RodeoHouston and was spotted running away from the rodeo grounds at NRG Stadium. The Houston ...

Cow Gallstones explained that the gallstones are found in the gallbladder of cattle (usually older cattle) and are typically "round, oval or pyramidal" with a "golden yellow, orange-brown or dark ...

However, over the last decade or so, the gallstone business has exploded, creating an underground market that's leaving some cattle farmers around the world worried — and U.S. officials suggesting ...