LINCOLN, Neb. (AP) – University of Nebraska-Lincoln researchers have received a $2.4 million federal grant to study why cattle are more likely to transmit E. coli bacteria than other animals.  The five-year grant from the U.S. Department of Agriculture is expected to build on other research led by food microbiologist Andy Benson.  Researchers will try to figure out what makes livestock so-called “super-shedders” of pathogens.  The bacteria strain they are studying is known to colonize in a cow’s gut, and can be transmitted to humans through improperly cooked beef.  Scientists say the research may help devise strategies to stop the disease earlier during cow processing.