Effects of Antibiotics, Zinc Oxide Or a Rare Earth…

Effects of Antibiotics, Zinc Oxide Or a Rare Earth...

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INTRODUCTION Antibiotics have been used in livestock production for over 50 years (Kim et al., 2005). When used at subtherapeutic levels in swine feeds, antibiotics improve growth rate and feed efficiency, reduce mortality and morbidity and improve reproductive performance (Cromwell, 2002). Antibiotics are also widely used at intermediate levels to prevent disease and at therapeutic levels to…

Effects of Antibiotics, Zinc Oxide Or a Rare Earth...



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