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Selection of cows for treatment at dry-off on organic dairy farms

Published online by Cambridge University Press:  15 November 2016

Klemens Kiesner ,
Nicole Wente ,
Otto Volling  and
Volker Krömker
Klemens Kiesner
Affiliation:
Faculty II, Department of Bioprocess Engineering – Microbiology, University of Applied Sciences and Arts Hannover, Heisterbergallee 12, 30453 Hannover, Germany Clinic for Cattle, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
Nicole Wente
Affiliation:
Faculty II, Department of Bioprocess Engineering – Microbiology, University of Applied Sciences and Arts Hannover, Heisterbergallee 12, 30453 Hannover, Germany
Otto Volling
Affiliation:
Bioland e.V., Bahnhofsstraße 15d, 27374 Visselhövede, Germany
Volker Krömker*
Affiliation:
Faculty II, Department of Bioprocess Engineering – Microbiology, University of Applied Sciences and Arts Hannover, Heisterbergallee 12, 30453 Hannover, Germany Clinic for Cattle, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, 30173 Hannover, Germany
*
*For correspondence; e-mail: volker.kroemker@hs-hannover.de
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Abstract

Restrictions regarding the use of antibiotics make selective antibiotic dry cow therapy (DCT) mandatory on organic farms in Germany. This requires methods for identifying cows with an intramammary infection (IMI) at dry-off. The aim of this field study was to create a decision scheme for the use of DCT based on cow level factors associated with IMI at dry-off and the probability of both cure and new infection (NI) during the dry period. Data from 250 cows from five organic farms were collected including somatic cell counts (SCC) from Dairy Herd Improvement (DHI) records, California mastitis test (CMT) results at dry-off, clinical mastitis (CM) history, parity and dry-off treatment. IMI at dry-off were most accurate identified using a geometric mean SCC of 100 000 cells/ml as a threshold at either one or three DHI records prior to dry-off. Using a combination of SCC with either CM history, CMT at dry off or parity slightly increased the sensitivity of detection (SE). The probability of cure of the infection over the dry period increased with use of both antibiotic DCT and application of an internal teat sealant (ITS) and decreased when the dry period was longer than 56 d. The risk of NI decreased with the use of ITS and infections with minor pathogens at dry-off. Compared with the selection performed by the farmers during the study period identification of IMI based on the selection criterion with a defined SCC threshold achieved a higher SE.

Keywords

Selective dry cow therapyorganic farminginfection at dry-offsomatic cell count
Type
Research Article
Information
Journal of Dairy Research , Volume 83 , Issue 4 , November 2016 , pp. 468 - 475
Copyright
Copyright © Proprietors of Journal of Dairy Research 2016 

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