| Individual animal risk factors for clinical mastitis in meat sheep in Norway. | |
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MedLine Citation:
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PMID: 18514940 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An m:n matched case-control study was conducted to identify risk factors for ovine clinical mastitis (CM). Data were from a national sheep registry and only ewes that lambed in the spring of 2004 were included. Eligible cases (n = 2857) and controls (n = 76,716) from 1056 flocks of meat sheep were matched on flock and conditional logistic regression was used for analysis of the data. CM risk was associated with age of the ewe and whether or not assistance at lambing was needed owing to dystocia; however, the effects of both these factors were modified by the number of lambs born. In ewes with 1 lamb, increasing age was associated with increased odds of CM (OR = 1.2 for each 1-year increase), while only a slight numerical increase in the odds was observed in ewes with >1 lamb. Dystocia was associated with increased odds of CM in ewes with 1 lamb (OR = 1.7) or 2 lambs (OR = 1.4), while no association was observed in ewes with > 2 lambs. The odds of CM increased markedly with increasing number of lambs born to the ewe. For example, odds for 2-year-old ewes without dystocia were 6.7 times greater for those with > 3 lambs than for those with 1 lamb. Compared with ewes of old Norwegian breeds, ewes of other breeds were more likely to experience CM (OR = 1.7). Ewes treated for CM at least once during the preceding 3 years had 4.0 times greater odds of CM compared with ewes without a CM history. It is likely that the effect estimates from this study, which are adjusted for breed and unaffected by inter-flock variations, are valid also for other meat sheep populations. |
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Authors:
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Steinar Waage; Synnøve Vatn |
Publication Detail:
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Type: Journal Article Date: 2008-06-02 |
Journal Detail:
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Title: Preventive veterinary medicine Volume: 87 ISSN: 0167-5877 ISO Abbreviation: Prev. Vet. Med. Publication Date: 2008 Nov |
Date Detail:
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Created Date: 2008-10-16 Completed Date: 2008-12-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8217463 Medline TA: Prev Vet Med Country: Netherlands |
Other Details:
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Languages: eng Pagination: 229-43 Citation Subset: IM |
Affiliation:
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Department of Production Animal Clinical Sciences, Norwegian School of Veterinary Science, Ullevaalsvn. 72, PO Box 8146 Dep, 0033 Oslo, Norway. steinar.waage@veths.no |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aging Animals Case-Control Studies Female Litter Size Logistic Models Mastitis / epidemiology, veterinary* Norway / epidemiology Odds Ratio Pregnancy Risk Factors Sheep Sheep Diseases / epidemiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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