Observations on bacteriologic isolation from pairs of quarter-milk samples
Postle, D.S.
Journal of the American Veterinary Medical Association 168(3): 220-222
1976
ISSN/ISBN: 0003-1488 PMID: 1248954 Document Number: 107166
Observations are reported on the agreement of bacteriological isolation between 11 917 pairs of quarter-milk samples collected as either duplicate samples (both samples collected during one farm visit) or consecutive samples (two samples collected at different milkings). Better agreement was found for duplicate samples (95.5%) than for consecutive samples (88.5% for interval of 2-7 days and 81.3% for interval of 8-16 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%.