Document Detail

Clinical mastitis in Norwegian herds after a combined selective dry-cow therapy and teat-dipping trial.
MedLine Citation:
PMID:  17106097     Owner:  NLM     Status:  MEDLINE    
The objective of this study was to see if introduction of a 2-yr combined selective dry-cow therapy and teat-dipping trial would reduce clinical mastitis (CM) events in 164 Norwegian dairy herds. Three different penicillin or penicillin/dihydrostreptomycin-based dry-cow treatments, and 3 different teat-dipping regimens (negative control, iodine teat dip, or an external teat sealant) were independently and randomly allocated to each herd. Complete lactations both before and during the trial were investigated. Altogether, 1,005 CM cases were recorded in the lactations before the trial and 924 cases were recorded during the trial. Bacteriological milk samples were available from 784 of the 924 CM cases during the trial. Among these, Staphylococcus aureus were isolated from 47.4%, Streptococcus dysgalactiae from 22.5%, Escherichia coli from 10.7%, and coagulase-negative staphylococci from 6.3%. In addition, 12.5% cases were bacteriological negative, and the remainder of the CM cases were caused by other microbes. The different models were analyzed using Cox regression analysis with PROC PHREG and a positive stable frailty model in the SAS macro. Separate models were made for cows housed in tie-stalls and free-stalls. Parity had a significant impact on the CM risk in both type of stalls. Older cows (parity > 3) had the highest hazard ratio of contracting CM in tie-stalls (1.68) and free-stalls (2.18) compared with parity 1. The CM risk decreased significantly (13%) in tie-stalls and by 18% in free-stalls. In tie-stalls, iodine-dipped cows had a significantly lower chance (21%) of getting CM compared with the negative control and the use of external teat sealant. The same trend was seen in free-stalls; however, the differences were not significant. Compared with CM before the trial, the reduction of CM was 15% during the trial.
A C Whist; O Østerås; L Sølverød
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  89     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2006 Dec 
Date Detail:
Created Date:  2006-11-19     Completed Date:  2008-07-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4649-59     Citation Subset:  IM    
Norwegian School of Veterinary Science, Department of Production Animal Clinical Sciences, PO Box 8146, N-0033 Oslo, Norway.
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MeSH Terms
Anti-Bacterial Agents / administration & dosage,  pharmacology
Bacteria / drug effects,  isolation & purification*
Dairying / methods*
Dihydrostreptomycin Sulfate / administration & dosage,  pharmacology
Iodine / administration & dosage
Mammary Glands, Animal / drug effects,  microbiology*
Mastitis, Bovine / microbiology,  prevention & control,  therapy*
Milk / microbiology
Models, Statistical
Penicillin G / administration & dosage,  pharmacology
Risk Factors
Time Factors
Reg. No./Substance:
0/Anti-Bacterial Agents; 5490-27-7/Dihydrostreptomycin Sulfate; 61-33-6/Penicillin G; 7553-56-2/Iodine

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

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