title: Use of antibiotics in a dairy herd and their effect on resistance determinants in enteric and environmental Escherichia coli.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D002417:Cattle; D004096:Dihydrostreptomycin Sulfate / Q000494:pharmacology / Q000627:therapeutic use; D004926:Escherichia coli / Q000187:drug effects* / Q000302:isolation & purification; D005243:Feces / Q000382:microbiology; D005260:Female; D008414:Mastitis, Bovine / Q000188:drug therapy*; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D010406:Penicillins / Q000627:therapeutic use
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins; D000667:Ampicillin; D004096:Dihydrostreptomycin Sulfate