Residues of dry cow antimicrobials in colostrum and extended-spectrum and AmpC β-lactamase producing Escherichia coli in feces from young dairy calves Bằng T.J.G.M. Lam, M.A. Gonggrijp, A.G.J. Velthuis, M.G. Pikkemaat, I.M.G.A. Santman-Berends, A.E. Heuvelink

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