OBJECTIVE: To perform a herd-level analysis of economic losses associated with paratuberculosis in dairy herds. DESIGN: Cross-sectional study. SAMPLE POPULATION: A multistage stratified random sample of 121 dairy herds in Michigan. PROCEDURE: A 2-part questionnaire was used to gather data on management practices, herd productivity, labor use, and expenditures. Blood samples were collected from a random sample of cows > or = 2 years old in each herd and tested for antibodies to Mycobacterium paratuberculosis. A herd was considered negative for paratuberculosis if results for all cows tested were negative. Multivariable linear regression was used to evaluate the data. RESULTS: A 10% increase in proportion of cows positive for paratuberculosis was associated with a 33.4 kg (73.5 lb) decrease in mean weight of culled cows. Mortality rate among herds positive for paratuberculosis was 3% higher than rate among herds negative for paratuberculosis. Herds positive for paratuberculosis did not have a significantly higher annual number of hours of labor per cow than did herds negative for paratuberculosis. CLINICAL IMPLICATIONS: For a herd of average size and cull rate, the reduction in mean weight of culled cows attributable to paratuberculosis represented a loss of approximately $1,150 annually for each 10% increase in herd prevalence of paratuberculosis. The increased mortality rate attributable to paratuberculosis represented a loss of between $1,607 and $4,400 on the basis of lost slaughter value and cost of replacement heifers.
OBJECTIVE: To perform a herd-level analysis of economic losses associated with paratuberculosis in dairy herds. DESIGN: Cross-sectional study. SAMPLE POPULATION: A multistage stratified random sample of 121 dairy herds in Michigan. PROCEDURE: A 2-part questionnaire was used to gather data on management practices, herd productivity, labor use, and expenditures. Blood samples were collected from a random sample of cows > or = 2 years old in each herd and tested for antibodies to Mycobacterium paratuberculosis. A herd was considered negative for paratuberculosis if results for all cows tested were negative. Multivariable linear regression was used to evaluate the data. RESULTS: A 10% increase in proportion of cows positive for paratuberculosis was associated with a 33.4 kg (73.5 lb) decrease in mean weight of culled cows. Mortality rate among herds positive for paratuberculosis was 3% higher than rate among herds negative for paratuberculosis. Herds positive for paratuberculosis did not have a significantly higher annual number of hours of labor per cow than did herds negative for paratuberculosis. CLINICAL IMPLICATIONS: For a herd of average size and cull rate, the reduction in mean weight of culled cows attributable to paratuberculosis represented a loss of approximately $1,150 annually for each 10% increase in herd prevalence of paratuberculosis. The increased mortality rate attributable to paratuberculosis represented a loss of between $1,607 and $4,400 on the basis of lost slaughter value and cost of replacement heifers.
Authors: Mohamed Salem; Carsten Heydel; Amr El-Sayed; Samia A Ahmed; Michael Zschöck; George Baljer Journal: Trop Anim Health Prod Date: 2012-09-30 Impact factor: 1.559
Authors: Sung Jae Shin; Byung Soo Lee; Won-Jung Koh; Elizabeth J B Manning; Kelly Anklam; Srinand Sreevatsan; Randall S Lambrecht; Michael T Collins Journal: J Clin Microbiol Date: 2010-09-01 Impact factor: 5.948
Authors: Syed M Faisal; Jenn-Wei Chen; Falong Yan; Tsai-Tzu Chen; Nicodemus M Useh; Weiwei Yan; Shanguang Guo; Shih-Jon Wang; Amy L Glaser; Sean P McDonough; Bhupinder Singh; William C Davis; Bruce L Akey; Yung-Fu Chang Journal: Clin Vaccine Immunol Date: 2013-02-13