Sentence:  Increases rate of gain and improves feed efficiency , aids in the prevention or treatment ( depending on level fed ) of the early stages of shipping fever , prevents or treats bacterial diarrhea , and aids in reducing incidence of bloat and liver <WSD>abscesses</WSD> . 
Meaning of the word marked with <WSD> tags:  symptom consisting of a localized collection of pus surrounded by inflamed tissue