VirginiamycinFood AdditivesStreptogramin Group BPlectonemaStreptogramins4-ButyrolactoneStreptomycesTylosinAnti-Bacterial AgentsHelix-Turn-Helix MotifsBacitracinAnimal FeedLiver AbscessFuransEnterococcus faeciumMonensinDrug Resistance, MicrobialDigestionRibosomesIleumRumenChickensSwineBacteriaBacterial ProteinsFermentationMicrobial Sensitivity Tests