Ralston Purina sold its feed business to BP.

The price that BP Nutrition paid for Purina Mills, which controls about 10% of the U.S. animal feed market, wasn’t disclosed. St. Louis-based Purina Mills produces feed for horses, cattle, chickens, hogs and other farm animals. The company employs about 3,000 at 70 plants in 32 states. BP Nutrition, a unit of British Petroleum, operates a major animal feed business in Europe.