Researchers at University of Missouriâs Southwest Research Center are inviting beef producers to take part in a program to identify beef cows that use feed efficiently. MU Extension researchers will mine data from the GrowSafe system to help producers select breeding stock cows that eat less than other cows while producing calves with similar growth, says Reagan Bluel, interim superintendent of Southwest Center, an MU research farm in Lawrence County. Currently, most systems measure feed efficiency by pens. The GrowSafe system tracks individual feed intake and weight gain. Cows that eat less will reward producers by reducing ongoing production costs over long periods, Bluel says.