Document Detail

Electrical conductivity of milk: ability to predict mastitis status.
MedLine Citation:
PMID:  15259246     Owner:  NLM     Status:  MEDLINE    
Electrical conductivity (EC) of milk has been introduced as an indicator trait for mastitis over the last decade, and it may be considered as a potential trait in a breeding program where selection for improved udder health is included. In this study, various EC traits were investigated for their association with udder health. In total, 322 cows with 549 lactations were included in the study. Cows were classified as healthy or clinically or subclinically infected, and EC was measured repeatedly during milking on each quarter. Four EC traits were defined; the inter-quarter ratio (IQR) between the highest and lowest quarter EC values, the maximum EC level for a cow, IQR between the highest and lowest quarter EC variation, and the maximum EC variation for a cow. Values for the traits were calculated for every milking throughout the entire lactation. All EC traits increased significantly (P < 0.001) when cows were subclinically or clinically infected. A simple threshold test and discriminant function analysis was used to validate the ability of the EC traits to distinguish between cows in different health groups. Traits reflecting the level rather than variation of EC, and in particular the IQR, performed best to classify cows correctly. By using this trait, 80.6% of clinical and 45.0% of subclinical cases were classified correctly. Of the cows classified as healthy, 74.8% were classified correctly. However, some extra information about udder health status was obtained when a combination of EC traits was used.
E Norberg; H Hogeveen; I R Korsgaard; N C Friggens; K H M N Sloth; P Løvendahl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  87     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-07-19     Completed Date:  2004-08-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1099-107     Citation Subset:  IM    
Department of Animal Breeding and Genetics, Danish Institute of Agricultural Sciences, Research Center Foulum, Tjele, Denmark.
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MeSH Terms
Discriminant Analysis
Electric Conductivity
Health Status
Mammary Glands, Animal / physiopathology
Mastitis, Bovine / diagnosis*,  physiopathology
Milk / physiology*
Sensitivity and Specificity

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