Document Detail

Errors associated with milk cell counting.
MedLine Citation:
PMID:  15518404     Owner:  NLM     Status:  MEDLINE    
The accuracy of somatic cell counts in milk samples was investigated in four studies. First, the counts recorded by one milk buyer in one supply over six months ranged from 105,000 to 401,000 cells/ml with no apparent changes in the volume of milk consigned or the level of mastitis in the herd that would explain this wide range. Secondly, the counts in daily samples from one bulk milk supply for 28 days ranged from 84,000 to 282,000 cells/ml, again with no apparent changes in the performance of the herd to explain the wide range. Thirdly, the replicated counts recorded for one sample by three separate laboratories agreed closely; however, when a sample with a high cell count was interspersed then two of the three laboratories reported high cell counts suggestive of 'carry-over' in excess of the 2 per cent 'allowable' Finally, cell count data from three separate laboratories on samples from 21 cows for 33 days revealed problems with the misidentification of samples on the farm in 1 per cent of the samples, and misidentification and mishandling of 1 to 2.6 per cent of the samples in the laboratories. All three laboratories differentiated samples from cows with subclinical and clinical mastitis, but the mean cell count of the uninfected cows varied between the laboratories with one of them recording statistically significantly higher counts over the period.
J E Hillerton; E A Berry; M B Gravenor; N Middleton
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Veterinary record     Volume:  155     ISSN:  0042-4900     ISO Abbreviation:  Vet. Rec.     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-11-02     Completed Date:  2005-02-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0031164     Medline TA:  Vet Rec     Country:  England    
Other Details:
Languages:  eng     Pagination:  445-8     Citation Subset:  IM    
Institute for Animal Health, Compton, Newbury, Berkshire RC20 7NN.
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MeSH Terms
Cell Count / veterinary
Laboratories / standards*
Mass Screening / methods,  veterinary
Mastitis, Bovine / diagnosis*
Milk / cytology*,  microbiology,  standards*
Quality Control
Reference Values
Sensitivity and Specificity
Specimen Handling / methods,  veterinary

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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