As the U.S. Food and Drug Administration (FDA) tightens its control on the use of antibiotics, farmers are looking at ways in which they can reduce the amount of antibiotics used in raising livestock.

Chad Ingels, a Fayette County Farm Bureau member, raises pigs under a contract for Niman Ranch. As part of the contract, growers like Ingels aren’t allowed to use antibiotics. Therefore, he said using vaccinations to prevent illness is essential in raising healthy...