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Heifers (n=136) from 5 herds were treated with a commercially available β-lactam intramammary (IMM) antibiotic preparation containing cephapirin sodium at 10–21 d prior to anticipated parturition to evaluate the risk of antibiotic residues occurring in milk postpartum and to determine factors associated with antibiotic residues and IMM pathogen presence in milk postpartum. Mammary secretions collected...
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