Subclinical mastitis in dairy cows in Swiss organic and conventional production systems

Roesch, Markus; G Doherr, Marcus; Schären, Walter; Schällibaum, Melchior; Blum, Jürg W (2007). Subclinical mastitis in dairy cows in Swiss organic and conventional production systems. Journal of dairy research, 74(1), pp. 86-92. London: Cambridge University Press 10.1017/S002202990600210X

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The objective was to compare the prevalence of subclinical mastitis (SM) and of udder pathogens in 60 Swiss organic (OP) and 60 conventional production systems (CP). Cows (n=970) were studied for SM prevalence and udder pathogens at median 31 d and 102 d post partum. Cows showing a >/=1+ positive California Mastitis Test (CMT) in at least one quarter were considered to have SM. Cow-level prevalences of SM for visits at 31 d and 102 d post partum (39% and 40% in OP and 34% and 35% in CP) were similar, but quarter-level prevalences of SM were higher (P<0.02) in OP than CP (15% and 18% in OP and 12% and 15% in CP). Median somatic cell counts in milk at 31 d post partum were higher (P<0.05) in OP than CP cows (43000 and 28000 cells/ml, respectively), but were similar at 102 d post partum in OP and CP cows (45000 and 38000 cells/ml, respectively). In milk samples from quarters showing a CMT reaction >/=2+ the prevalences of coagulase negative staphylococci were lower (P<0.05) at 102 d post partum, whereas prevalences of non-agalactiae streptococci were higher (P<0.05) in OP than in CP cows at 31 d and 102 d post partum. In conclusion, under Swiss conditions, subclinical mastitis is a greater problem in organic than in conventional production systems, but differences are not marked.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Veterinary Medicine (DKV) > DVK - Clinical Research (discontinued)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Experimental Clinical Research
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Veterinary Physiology

UniBE Contributor:

Doherr, Marcus and Blum, Jürg

ISSN:

0022-0299

Publisher:

Cambridge University Press

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:47

Last Modified:

03 Feb 2015 10:12

Publisher DOI:

10.1017/S002202990600210X

PubMed ID:

16978453

Web of Science ID:

000245024800013

URI:

https://boris.unibe.ch/id/eprint/19350 (FactScience: 1898)

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