Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

    Records 1 - 20 / 112

    • help
    • print

      Print search results

    • export

      Export search results

    Check title to add to marked list
    A simulation of Johne's disease control
    Groenendaal, H. ; Nielen, M. ; Jalvingh, A.W. ; Horst, S.H. ; Galligan, D.T. ; Hesselink, J.W. - \ 2002
    Preventive Veterinary Medicine 54 (2002). - ISSN 0167-5877 - p. 225 - 245.
    A dynamic and stochastic simulation model (the "JohneSSim model") was developed to evaluate the economic and epidemiological effects of different strategies for control of paratuberculosis in dairy herds. Animals occupy one of the six defined infection states; the spread of Johne's disease is modeled with five infection routes. Many different dairy farm situations can be simulated. Control strategies that can be simulated are: (1) test-and-cull; (2) calf hygiene management; (3) vaccination and (4) grouping of animals. Losses are caused by: (1) reduced milk production; (2) diagnosis and treatment costs; (3) lower slaughter value of cows and (4) sub-optimal culling. The benefits were calculated as reduction in the losses caused by Johne's disease; the costs of each strategy were calculated on the basis of actual costs of each item; and net present value (NPV) was calculated as benefits minus costs. Herd and prevalence data from The Netherlands and Pennsylvania, USA were used. In both situations, a low true mean prevalence within 20 years could be reached only when all calf management tools were applied. The Dutch control program (PPN) was on average economically attractive (with or without labor costs, the average NPV was Euro 1183 and 12,397, respectively). In Pennsylvania, contract heifer rearing and improved calf hygiene reduced the prevalence effectively and had large economic benefits (US$ 43,917 for 20-year period) if the calves were sent to the heifer facility while very young. Validation with data from 21 infected Dutch dairy farms (as well as face-validation: comparison of the results of the JohneSSim model with experiences of Johne's experts) supported the basic assumptions in the model.
    Spatial and stochastic simulation to compare two emergency-vaccination strategies with a marker vaccine in the 1997/98 Dutch classical swine fever epidemic
    Mangen, M.J.J. ; Jalvingh, A.W. ; Nielen, M. ; Mourits, M.C.M. ; Klinkenberg, D. ; Dijkhuizen, A.A. - \ 2001
    Wageningen : Farm Management Group (Internal EU-report FAI5-PL97-3566) - 34 p.
    An economic model to calculate farm-specific losses due to bovine respiratory disease in dairy heifers
    Fels-Klerx, H.J. van der; S¢rensen, J.T. ; Jalvingh, A.W. ; Huirne, R.B.M. - \ 2001
    Preventive Veterinary Medicine 51 (2001). - ISSN 0167-5877 - p. 75 - 94.
    Spatial and stochastic simulation to compare two emergency-vaccination strategies with a marker vaccine in the 1997/1998 Dutch Classical Swine Fever epidemic
    Mangen, M.J.J. ; Jalvingh, A.W. ; Nielen, M. ; Mourits, M.C.M. ; Klinkenberg, D. ; Dijkhuizen, A.A. - \ 2001
    Preventive Veterinary Medicine 48 (2001). - ISSN 0167-5877 - p. 177 - 200.
    Evaluating control strategies for outbreaks in BHV1-free areas using stochastic and spatial simulation
    Vonk Noordegraaf, A. ; Jalvingh, A.W. ; Jong, M.C.M. de; Franken, P. ; Dijkhuizen, A.A. - \ 2000
    Preventive Veterinary Medicine 44 (2000). - ISSN 0167-5877 - p. 21 - 42.
    Several countries within the EU have successfully eradicated bovine herpesvirus type I (BHV1), while others are still making efforts to eradicate the virus. Reintroduction of the virus into BHV1-free areas can lead to major outbreaks — thereby causing severe economic losses. To give decision-makers more insight into the risk and economic consequences of BHV1 reintroduction and into the effectiveness of various control strategies, we developed the simulation model InterIBR. InterIBR is a dynamic model that takes into account risk and uncertainty and the geographic location of individual farms. Simulation of a BHV1-outbreak in the Netherlands starts with introduction of the virus on a predefined farm type, after which both within-farm and between-farm transmission are simulated. Monitoring and control measures are implemented to simulate detection of the infection and subsequent control. Economic consequences included in this study are related to losses due to infection and costs of control. In the simulated basic control strategy, dairy farms are monitored by monthly bulk-milk tests and miscellaneous farms are monitored by half-yearly serological tests. After detection, movement-control measures apply, animal contacts are traced and neighbour farms are put on surveillance. Given current assumptions on transmission dynamics, we conclude that a strategy with either rapid removal or vaccination of infected cattle does not reduce the number of infected farms compared to this basic strategy — but will cost more to control. Farm type with first introduction of BHV1 has a considerable impact on the expected number of secondarily infected farms and total costs. To limit the number of infected farms and total costs due to outbreaks, we suggest intensifying the monitoring program on farms with a high frequency of cattle trade, and monthly bulk-milk testing on dairy farms
    Evaluation of national safeguarding strategies by simulation : case study for IBR
    Vonk Noordegraaf, A. ; Jalvingh, A.W. ; Nielen, M. ; Jong, M.C.M. de; Franken, P. ; Dijkhuizen, A.A. - \ 2000
    In: Proceedings of the Xth congress on animal hygiene : Xth Congress on animal hygiene, Maastricht, 2000 / Tielen, M.J.M., Voets, M.Th., Maastricht : - p. 338 - 341.
    An economic model to estimate farm-specific losses due to Bovine Respiratory Diseases in dairy heifers
    Fels-Klerx, H.J. van der; Jalvingh, A.W. ; Huirne, R.B.M. ; Dijkhuizen, A.A. - \ 2000
    In: Proceedings of a meeting held at the University of Edinburgh on the 29th, 30th and 31st o March 2000 : Society for Veterinary Epidemiology and Preventive Medicine, Edinburg, 2000 / M.V. Thrusfield and E.A. Goodall. - Edinburgh : [s.n.], 2000. - ISBN 0 948073 44 6 - p. 163 - 170.
    Economic decision model to optimize voluntary culling decisions for beef brood cows at weaning
    Rohrbach, B.W. ; Jalvingh, A.W. ; Larson, J.A. ; Stokes, J.R. ; Dijkhuizen, A.A. - \ 2000
    In: Proceedings of the 9th Symmposium of the International Society for Veterinary Epidemiology and Economics : ISVEE 9, Breckenridge, Colorado, 2000 / Salman, M.D., Morley, Paul S., Ruch-Gallie, Rebecca, - p. 312 - 314.
    Spatial and stochastic modelling of emergency vaccination strategies for the Dutch 97/98 Classical Swine Fever epidemic
    Mangen, M.J.J. ; Nielen, M. ; Jalvingh, A.W. ; Mourits, M. - \ 2000
    In: Proceedings of the Symposium on Economic Modelling of Animal Health and Farm Management : Economic Modelling of Animal Health and Farm Management, Wageningen, 2000 / van der Fels-Klerx, H.J., Mourits, M., Wageningen : Farm Management Group - p. 133 - 138.
    Economic comparison of two different emergency vaccination strategies with a marker vaccine in a simulation of the Dutch CSF epidemic in 1997/98
    Mangen, M.J.J. ; Nielen, M. ; Jalvingh, A.W. ; Dijkhuizen, A.A. - \ 2000
    In: Proceedings of the 9th Symposium of the International Society for Veterinary Epidemiology and Economics : ISVEE 9, Breckenridge, Colorado, 2000 / Salman, M.D., Morley, Paul S., Ruch-Gallie, Rebecca, Breckenridge : - p. 91 - 93.
    Simulation of two different emergency vaccination campaigns with marker vaccine in the control of the Dutch CSF epidemic in 1997/98
    Mangen, M.M.J. ; Nielen, M. ; Jalvingh, A.W. ; Dijkhuizen, A.A. - \ 2000
    In: Proceedings of a meeting held at the University of Edinburgh on the 29th, 30th and 31st of March 2000 : Society for Veterinary Epidemiology and Preventive Medicine, Edinburgh, 2000 / Thrusfield, M.V., Goodall, E.A., - p. 48 - 59.
    A simulation model to study the epidemiological and economic consequences of Johne's disease control programs
    Groenendaal, H. ; Jalvingh, A.W. ; Nielen, M. ; Horst, H.S. - \ 2000
    In: Proceedings of the Symposium on Economic Modelling of Animal Health and Farm Management : Economic Modelling of Animal Health and Farm Management, Wageningen, 2000 / H.J. van der Fels-Klerx and M. Mourits. - Wageningen : Farm Management Group, Department of Social Sciences, Wageningen University, 2000 - p. 103 - 105.
    A simulation model to study the epidemiological and economic consequences of Johne's Disease control programs
    Groenendaal, H. ; Jalvingh, A.W. ; Nielen, M. ; Horst, H.S. - \ 2000
    In: Proceedings of the 9th Symposium of the International Society for Veterinary Epidemiology and Economics : ISVEE 9, Breckenridge, Colorado, 2000 / M.D. Salman, Paul S. Morley and Rebecca Ruch-Gallie. - Breckenridge : [s.n.], 2000 - p. 590 - 592.
    Simulation modelling to support policy making in the control of Bovine Herpes Virus type I
    Vonk Noordegraaf, A. ; Jalvingh, A.W. ; Nielen, M. ; Franken, P. ; Dijkhuizen, A.A. - \ 1999
    In: proceedings of Society for Veterinary Epidemiology and Preventive Medicine, Bristol, U.K., 24 - 26 March 1999 - p. 18 - 19.
    Spatial and stochastic simulation to evaluate the impact of events and control measures on the 1997-1998 classical swine fever epidemic in The Netherlands : II. Comparison of control strategies
    Nielen, M. ; Jalvingh, A.W. ; Meuwissen, M.P.M. ; Horst, S.H. ; Dijkhuizen, A.A. - \ 1999
    Preventive Veterinary Medicine 42 (1999). - ISSN 0167-5877 - p. 297 - 317.
    The impact of events and control measures on the 1997/98 CSF-epidemic in the Netherlands : results of an evaluation using simulation
    Jalvingh, A.W. ; Nielen, M. ; Horst, H.S. - \ 1999
    In: ESVV 4th Pestvirus Meeting, Giessen, Germany, 1999. - Giessen : Justus-liebig-Universitaet, 1999 - p. S1 - 6.
    Spatial and stochastic simulation to evaluate the impact of events and control measures on the 1997-1998 classical swine fever epidemic in The Netherlands : I. Description of simulation model
    Jalvingh, A.W. ; Nielen, M. ; Maurice, H. ; Stegeman, A.J. ; Elbers, A.R.W. ; Dijkhuizen, A.A. - \ 1999
    Preventive Veterinary Medicine 42 (1999). - ISSN 0167-5877 - p. 271 - 295.
    Modelstudie voorbereiding bestrijding Paratbc op bedrijven met zoogkoeien
    Groenendaal, H. ; Jalvingh, A.W. ; Horst, H.S. - \ 1999
    Wageningen : Onderzoeksgroep Economie van Dierziekten, Leerstoelgroep Agrarische Bedrijfseconomie, Landbouwuniversiteit Wageningen - 51 p.
    Modelstudie voorbereiding bestrijding Paratbc
    Groenendaal, H. ; Jalvingh, A.W. ; Horst, H.S. - \ 1999
    Wageningen : Onderzoeksgroep Economie van Dierziekten, Leerstoelgroep Agrarische Bedrijfseconomie, Landbouwuniversiteit Wageningen - 45 p.
    Potential economic benefits from changes in management via information technology applications on Dutch dairy farms : a simulation study
    Asseldonk, M.A.P.M. van; Jalvingh, A.W. ; Huirne, R.B.M. ; Dijkhuizen, A.A. - \ 1999
    Livestock Production Science 60 (1999). - ISSN 0301-6226 - p. 33 - 44.
    Economic benefits of information technologies were assessed at farm level by means of a dynamic probabilistic simulation model. The model included biological performances with respect to oestrus detection and concentrate feeding. In this way, main benefits of activity meters, automated concentrate feeders and on-line automated parlour systems for recording of milk production and milk temperature could be estimated. In comparison with the default situation, improvement in oestrus detection from 50% to 90% increased gross margin by Dfl. 1.28 per 100 kg fat and protein corrected milk (FPCM) per year under Dutch production conditions. This equals 8.0% of a farmer's typical net return to labour and management. Using an individual feeding system increased gross margin by Dfl. 0.77 per 100 kg FPCM per year and the net return to labour and management by 4.8%. Feeders increased the frequency of concentrate provision from two to four times a day. Moreover, a more accurate performance-related concentrate provision was achieved from total daily amount in portions of 1-0.1 kg. In addition feeders enabled the possibility of overcoming the limited concentrate intake for high-producing animals in the milking parlour in the beginning of the lactation. A more accurate milk production estimation increased gross margin and the net return to labour and management by Dfl. 0.17 per 100 kg FPCM and 1.1% respectively. In the latter case equilibrium feeding was compared with a feeding method in which concentrate supply was based on an standard deviation of 5% in the estimated energy requirements for milk production. The results of this study will be used to evaluate theoretically the economic viability of the investigated IT applications.
    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.