R W Shephard1, S H Williams2, S D Beckett3. 1. Herd Health Pty Ltd, 65 Beet Road, Maffra, Victoria, 3860, Australia. richard@herdhealth.com.au. 2. Scott Williams Consulting, Creswick, VIC, Australia. 3. SDBbio, Gundaroo, NSW, Australia.
Abstract
OBJECTIVE: To determine the farm economic impact of bovine Johne's disease (BJD) infection and controls in commercial Victorian dairy herds. DESIGN: Benefit-cost analysis of BJD and various control methods in a Victorian dairy herd. RESULTS: Farm losses from BJD occurred from clinical disease. Clinical cases occur on average in 5-year-old cows, resulting in losses of A$1895 in the year of culling and A$221 in the year preceding culling, giving a total loss of A$2116. Early removal also resulted in loss of future profit equating to A$375 per year. This is the annualised value of foregone future income and costs expressed as a net present value (NPV). The total loss from removal of a clinical case was estimated as A$2491. The average clinical incidence in infected dairy herds prior to entry into the Victorian Bovine Johne's Test-and-Control Program (TCP) was 1.8% and the average Victorian dairy herd size was 262 cows in 2013-14, resulting in annual losses of 4.7 clinical cases if infected and implementing no BJD control. Farm annual loss of profit was estimated as A$11,748 ($44.84 per cow/year). Control of BJD using vaccination, test-and-cull or combined approaches was economical but the cost of implementation in initial years would exceed disease costs. Vaccination-based control provided minimal long-term losses and was the most cost-effective control over a 10-year planning horizon. CONCLUSION: Endemic BJD resulted in modest but persistent losses in typical infected dairy herds. Control of disease using test-and-cull, vaccination or combined test-and-cull with vaccination was cost-effective.
OBJECTIVE: To determine the farm economic impact of bovineJohne's disease (BJD) infection and controls in commercial Victorian dairy herds. DESIGN: Benefit-cost analysis of BJD and various control methods in a Victorian dairy herd. RESULTS: Farm losses from BJD occurred from clinical disease. Clinical cases occur on average in 5-year-old cows, resulting in losses of A$1895 in the year of culling and A$221 in the year preceding culling, giving a total loss of A$2116. Early removal also resulted in loss of future profit equating to A$375 per year. This is the annualised value of foregone future income and costs expressed as a net present value (NPV). The total loss from removal of a clinical case was estimated as A$2491. The average clinical incidence in infected dairy herds prior to entry into the Victorian Bovine Johne's Test-and-Control Program (TCP) was 1.8% and the average Victorian dairy herd size was 262 cows in 2013-14, resulting in annual losses of 4.7 clinical cases if infected and implementing no BJD control. Farm annual loss of profit was estimated as A$11,748 ($44.84 per cow/year). Control of BJD using vaccination, test-and-cull or combined approaches was economical but the cost of implementation in initial years would exceed disease costs. Vaccination-based control provided minimal long-term losses and was the most cost-effective control over a 10-year planning horizon. CONCLUSION: Endemic BJD resulted in modest but persistent losses in typical infected dairy herds. Control of disease using test-and-cull, vaccination or combined test-and-cull with vaccination was cost-effective.
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