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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/279

Title: Direct and indirect effects of Johne's disease on farm and animal productivity in an Irish dairy herd
Authors: Richardson, EKB
More, Simon J
Keywords: clinical symptoms
culling
dairy cows
disease impacts
Johne's Disease
milk yield
Issue Date: 1-Aug-2009
Publisher: Biomed Central
Citation: Richardson EKB and More SJ. Direct and indirect effects of Johne's disease on farm and animal productivity in an Irish dairy herd. Irish Veterinary Journal, 2009, 62 (8), 526-532
Series/Report no.: Irish Veterinary Journal
Abstract: Johne's disease (JD) is caused by infection with the organism Mycobacterium avium spp. paratuberculosis, leading to chronic diarrhoea and ill thrift in adult cattle. JD is considered to adversely affect farm performance and profitability. This retrospective case study was undertaken on a single commercial dairy herd in the south west of Ireland. Animal production records were interrogated to assess the effect of JD on milk yield (total kg per lactation), somatic cell count (the geometric mean over the lactation), reasons for culling, cull price and changes in herd parity structure over time. JD groups were defined using clinical signs and test results. One control animal was matched to each case animal on parity number and year. Specific lactations (clinical, pre-clinical and test-positive only) from 1994 to 2004 were compared between JD case and control cows. A significantly lower milk yield (1259.3 kg/lactation) was noted from cows with clinical JD in comparison to their matched control group. Clinical animals had an average cull price of €516 less than animals culled without signs of clinical disease. In contrast, little effect was noted for sub-clinical infections. These direct effects of JD infections, in combination with increased culling for infertility and increasing replacement rates, had a negative impact on farm production. Results from this study provide preliminary information regarding the effects of JD status on both herd and animal-level performance in Ireland.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/279
http://dx.doi.org/10.1186/2046-0481-62-8-526
Appears in Collections:Teagasc publications in Biomed Central

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