title: Observations on bacteriologic isolation from pairs of quarter-milk samples.
abstract: Observations are reported on the agreement of bacteriologic isolation between 11,917 pairs of quarter-milk samples collected as either duplicate samples (both samples collected during 1 farm visit) or consecutive samples (2 samples collected at different milkings). Better agreement was found for duplicate samples (95.5%) than for consecutive samples (88.5% for interval of 2 to 7 days and 81.3% for interval of 8 to 16 days). From these observations, it was estimated that for diagnosing an intramammary infection, the examination of a single quarter-milk sample would be expected to have an error of approximately 3%.
mesh_terms: D000818:Animals; D001419:Bacteria / Q000302:isolation & purification*; D002417:Cattle; D005260:Female; D008414:Mastitis, Bovine / Q000382:microbiology*; D008722:Methods; D008892:Milk / Q000382:microbiology*; D013048:Specimen Handling / Q000662:veterinary*