Injectable antimicrobials in commercial feedlot cattle and their effect on the nasopharyngeal microbiota and antimicrobial resistance

•Administration of oxytetracycline or tulathromycin altered the nasopharyngeal microbiota of feedlot cattle.•Cattle receiving oxytetracycline or tulathromycin at feedlot entry had a lower relative abundance of Mannheimia and Mycoplasma at exit (≥60 d).•Administration of oxytetracycline increased the...

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