R D Bush1, P A Windsor, J-A L M L Toribio. 1. Farm Animal Health Group, Faculty of Veterinary Science, University of Sydney, PMB 3, Camden, New South Wales 2570.
Abstract
OBJECTIVE: To measure the biological and financial impact of ovine Johne's disease (OJD) mortalities on 12 infected flocks within the endemic area of southern New South Wales over a 3-year period. DESIGN AND POPULATION: An observational study was conducted over a 3-year period from 2002 to 2004 on sheep from 12 OJD-infected flocks from southern NSW. Flocks ranged from between 3,500 and 20,000 sheep. At the start of the study owner estimates of OJD mortality were 5% or greater. METHOD: Annual mortality rates were estimated from farm records provided by owners. The proportion of OJD mortalities was assessed after histological examination of tissues collected from dead and moribund sheep during 5-day necropsy inspections conducted in autumn, winter, spring and summer in 2002. The financial impact was estimated using a gross margin analysis for each of the three study years and by placing a financial value on the necropsied sheep. RESULTS: On the 12 farms, the average OJD mortality rate was 6.2% (range 2.1% to 17.5%) in 2002, 7.8% (range 1.8% to 14.6%) in 2003 and 6.4% (range 2% to 11.9%) in 2004. The average decrease in gross margin due to OJD infection on a farm in 2002 was 6.4% (range 2.2% to 15.4%), 8.5% (range 3.1% to 15.8%) in 2003 and 7.4% (range 1.5% to 15.4%) in 2004. This equates to an average reduction in annual income of $13,715 per farm per year. OJD losses accounted on average for two thirds of the total estimated financial loss associated with sheep deaths. CONCLUSION: This study demonstrates the significant biological and financial impact of OJD on sheep flocks. These findings are of relevance to all Australian sheep flocks infected or at risk of OJD infection.
OBJECTIVE: To measure the biological and financial impact of ovine Johne's disease (OJD) mortalities on 12 infected flocks within the endemic area of southern New South Wales over a 3-year period. DESIGN AND POPULATION: An observational study was conducted over a 3-year period from 2002 to 2004 on sheep from 12 OJD-infected flocks from southern NSW. Flocks ranged from between 3,500 and 20,000 sheep. At the start of the study owner estimates of OJD mortality were 5% or greater. METHOD: Annual mortality rates were estimated from farm records provided by owners. The proportion of OJD mortalities was assessed after histological examination of tissues collected from dead and moribund sheep during 5-day necropsy inspections conducted in autumn, winter, spring and summer in 2002. The financial impact was estimated using a gross margin analysis for each of the three study years and by placing a financial value on the necropsied sheep. RESULTS: On the 12 farms, the average OJD mortality rate was 6.2% (range 2.1% to 17.5%) in 2002, 7.8% (range 1.8% to 14.6%) in 2003 and 6.4% (range 2% to 11.9%) in 2004. The average decrease in gross margin due to OJD infection on a farm in 2002 was 6.4% (range 2.2% to 15.4%), 8.5% (range 3.1% to 15.8%) in 2003 and 7.4% (range 1.5% to 15.4%) in 2004. This equates to an average reduction in annual income of $13,715 per farm per year. OJD losses accounted on average for two thirds of the total estimated financial loss associated with sheep deaths. CONCLUSION: This study demonstrates the significant biological and financial impact of OJD on sheep flocks. These findings are of relevance to all Australian sheep flocks infected or at risk of OJD infection.
Authors: Karren M Plain; Kumudika de Silva; John Earl; Douglas J Begg; Auriol C Purdie; Richard J Whittington Journal: Infect Immun Date: 2011-07-05 Impact factor: 3.441
Authors: I F Espeschit; D G G Schwarz; A C S Faria; M C C Souza; F A Paolicchi; R A Juste; I A Carvalho; M A S Moreira Journal: Trop Anim Health Prod Date: 2017-09-07 Impact factor: 1.559
Authors: Auriol C Purdie; Karren M Plain; Douglas J Begg; Kumudika de Silva; Richard J Whittington Journal: Sci Rep Date: 2019-06-03 Impact factor: 4.379
Authors: Richard Whittington; Karsten Donat; Maarten F Weber; David Kelton; Søren Saxmose Nielsen; Suzanne Eisenberg; Norma Arrigoni; Ramon Juste; Jose Luis Sáez; Navneet Dhand; Annalisa Santi; Anita Michel; Herman Barkema; Petr Kralik; Polychronis Kostoulas; Lorna Citer; Frank Griffin; Rob Barwell; Maria Aparecida Scatamburlo Moreira; Iva Slana; Heike Koehler; Shoor Vir Singh; Han Sang Yoo; Gilberto Chávez-Gris; Amador Goodridge; Matjaz Ocepek; Joseba Garrido; Karen Stevenson; Mike Collins; Bernardo Alonso; Karina Cirone; Fernando Paolicchi; Lawrence Gavey; Md Tanvir Rahman; Emmanuelle de Marchin; Willem Van Praet; Cathy Bauman; Gilles Fecteau; Shawn McKenna; Miguel Salgado; Jorge Fernández-Silva; Radka Dziedzinska; Gustavo Echeverría; Jaana Seppänen; Virginie Thibault; Vala Fridriksdottir; Abdolah Derakhshandeh; Masoud Haghkhah; Luigi Ruocco; Satoko Kawaji; Eiichi Momotani; Cord Heuer; Solis Norton; Simeon Cadmus; Angelika Agdestein; Annette Kampen; Joanna Szteyn; Jenny Frössling; Ebba Schwan; George Caldow; Sam Strain; Mike Carter; Scott Wells; Musso Munyeme; Robert Wolf; Ratna Gurung; Cristobal Verdugo; Christine Fourichon; Takehisa Yamamoto; Sharada Thapaliya; Elena Di Labio; Monaya Ekgatat; Andres Gil; Alvaro Nuñez Alesandre; José Piaggio; Alejandra Suanes; Jacobus H de Waard Journal: BMC Vet Res Date: 2019-06-13 Impact factor: 2.741