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Fountain J, Brookes V, Kirkeby C, Manyweathers J, Maru Y, Hernandez-Jover M. One size does not fit all: Exploring the economic and non-economic outcomes of on-farm biosecurity for bovine viral diarrhoea virus in Australian beef production. Prev Vet Med 2022; 208:105758. [PMID: 36130460 DOI: 10.1016/j.prevetmed.2022.105758] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 09/05/2022] [Accepted: 09/12/2022] [Indexed: 11/16/2022]
Abstract
Bovine viral diarrhoea virus (BVDV) is a disease of global importance, affecting the production and welfare of cattle enterprises through poor reproductive performance and calf mortality. In Australia, the prevention of BVDV introduction and spread is primarily achieved with on-farm biosecurity; however, the use of these practices can vary amongst producers. Economic utility is commonly identified as a contributor to the uptake of on-farm biosecurity, but other factors such as animal welfare, producer priorities and introduction risk also influence farmer behaviour. This study uses an individual-based, stochastic simulation model to examine the economic and non-economic value of 23 on-farm biosecurity combinations for the control of BVDV in Australian beef farms without (N0) and with (N1) a neighbouring population of persistently infected (PI) cattle. Combinations of quarantine of purchased bulls (Q), hygiene during herd health events (H), double-fencing adjacent boundaries with neighbouring farms (F) and vaccination against BVDV (V) were tested. This study is the first to simulate the use of strategic PI exposure (PI) as an alternative to V, a contentious practice performed by some Australian beef farmers. Introduction of BVDV into a naïve 300-breeder self-replacing beef herd was achieved through the purchase of PI bulls (N0 and N1 herds) and over-the-fence contact with neighbouring PI animals (N1 herds only). The predicted median cumulative loss due to BVDV over a 15-year period was AUD$172/breeder and AUD$453/breeder for an N0 and N1 herd, respectively. Early establishment of BVDV in the simulation period was found to be the primary factor contributing to economic loss. Consequently, the Q and QF combinations resulted in the highest predicted average annual cost-benefit for BVDV-free N0 and N1 herds. In the five years following establishment of BVDV, use of QP (N0 herds) and V (N1 herds) combinations were most cost-effective. Combinations that involved V and P (in conjunction with F in N1 herds) also resulted in the lowest number of PI animals sold to other farms or feedlots over the simulation period. However, in both N0 and N1 herds, P resulted in the highest number of infected cattle, which has implications for poor animal welfare and increased antimicrobial use on Australian beef farms. The outcomes reported in this study can guide decisions to prevent BVDV introduction and spread on extensive beef farms using on-farm biosecurity, based on the risk of BVDV exposure and the priorities of the individual farmer.
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Affiliation(s)
- Jake Fountain
- Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
| | - Victoria Brookes
- School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia; Sydney School of Veterinary Science, Faculty of Science, The University of Sydney, Camperdown, NSW 2006, Australia.
| | - Carsten Kirkeby
- Section of Animal Welfare and Disease Control, Institute of Veterinary and Animal Sciences, Faculty of Medical and Health Sciences, University of Copenhagen, Frederiksberg C DK-1870, Denmark.
| | - Jennifer Manyweathers
- Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
| | - Yiheyis Maru
- Commonwealth Scientific and Industrial Research Organisation Land and Water, ACT 2601, Australia.
| | - Marta Hernandez-Jover
- Gulbali Institute, Charles Sturt University, Wagga Wagga, NSW 2678, Australia; School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia.
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LENG D, YAMADA S, CHIBA Y, YONEYAMA S, SAKAI Y, HIKONO H, MURAKAMI K. Co-administration of a plasmid encoding CD40 or CD63 enhances the immune responses to a DNA vaccine against bovine viral diarrhea virus in mice. J Vet Med Sci 2022; 84:1175-1184. [PMID: 35793950 PMCID: PMC9523294 DOI: 10.1292/jvms.22-0085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 06/26/2022] [Indexed: 11/30/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) causes substantial economic losses in the livestock industry worldwide. Plasmids encoding the BVDV E2 protein are potential DNA vaccines against BVDV, but their immunogenicity has been insufficient. Here, we investigated the adjuvant effect of CD40 and CD63 plasmids on the immune responses to a BVDV E2 DNA vaccine in mice. We constructed pUMVC4a-based plasmids encoding the BVDV E2 protein (pE2), mouse CD40 (pCD40), or mouse CD63 (pCD63). Protein expression by each plasmid was confirmed through Western blot analysis and immunofluorescence staining of cultured cell lines. BALB/c mice were immunized intradermally twice with pE2 in combination with, or without, pCD40 or pCD63, with 3 weeks between the two doses. pE2 with pCD40 induced significantly higher neutralizing antibody titers against BVDV than pE2 alone. pE2 with pCD63 induced significantly higher anti-E2 IgG2a antibody titers than pE2 alone. Furthermore, pE2 with pCD40 or pCD63 induced significantly increased lymphocyte proliferation and interferon (IFN)-γ production in response to BVDV, compared with E2 alone. These results suggest that a plasmid encoding CD40 or CD63 can be used as an adjuvant to enhance immune responses to DNA vaccines against BVDV.
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Affiliation(s)
- Dongze LENG
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
| | - Shinji YAMADA
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
| | - Yusuke CHIBA
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
| | - Syuji YONEYAMA
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
| | - Yusuke SAKAI
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
| | | | - Kenji MURAKAMI
- Graduate School of Veterinary Sciences, Iwate University, Iwate, Japan
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Fountain J, Hernandez-Jover M, Kirkeby C, Halasa T, Manyweathers J, Maru Y, Brookes V. Modeling the Effect of Bovine Viral Diarrhea Virus in Australian Beef Herds. Front Vet Sci 2022; 8:795575. [PMID: 34970621 PMCID: PMC8712561 DOI: 10.3389/fvets.2021.795575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 11/23/2021] [Indexed: 11/13/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) is an economically important disease in Australian beef farming. The disease typically results in low-level production losses that can be difficult to detect for several years. Simulation modeling can be used to support the decision to control BVDV; however, current BVDV simulation models do not adequately reflect the extensive farming environment of Australian beef production. Therefore, the objective of this study was to develop a disease simulation model to explore the impact of BVDV on beef cattle production in south-east Australia. A dynamic, individual-based, stochastic, discrete-time simulation model was created to simulate within-herd transmission of BVDV in a seasonal, self-replacing beef herd. We used the model to simulate the effect of herd size and BVDV introduction time on disease transmission and assessed the short- and long-term impact of BVDV on production outputs that influence the economic performance of beef farms. We found that BVDV can become established in a herd after a single PI introduction in 60% of cases, most frequently associated with the breeding period. The initial impact of BVDV will be more severe in smaller herds, although self-elimination is more likely in small herds than in larger herds, in which there is a 23% chance that the virus can persist for >15 years following a single incursion in a herd with 800 breeders. The number and weight of steers sold was reduced in the presence of BVDV and the results demonstrated that repeat incursions exacerbate long-term production losses, even when annual losses appear marginal. This model reflects the short- and long-term production losses attributed to BVDV in beef herds in southeast Australia and provides a foundation from which the influence and economic utility of BVDV prevention in Australian beef herds can be assessed.
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Affiliation(s)
- Jake Fountain
- Graham Centre for Agricultural Innovation (An Alliance Between Charles Sturt University and NSW Department of Primary Industries), School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia.,School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia
| | - Marta Hernandez-Jover
- Graham Centre for Agricultural Innovation (An Alliance Between Charles Sturt University and NSW Department of Primary Industries), School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia.,School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia
| | - Carsten Kirkeby
- Section of Animal Welfare and Disease Control, Institute of Veterinary and Animal Sciences, Faculty of Medical and Health Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Tariq Halasa
- Section of Animal Welfare and Disease Control, Institute of Veterinary and Animal Sciences, Faculty of Medical and Health Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Jennifer Manyweathers
- Graham Centre for Agricultural Innovation (An Alliance Between Charles Sturt University and NSW Department of Primary Industries), School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia.,School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia
| | - Yiheyis Maru
- Commonwealth Scientific and Industrial Research Organisation Land and Water, Canberra, ACT, Australia
| | - Victoria Brookes
- Graham Centre for Agricultural Innovation (An Alliance Between Charles Sturt University and NSW Department of Primary Industries), School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia.,School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia.,Sydney School of Veterinary Science, Faculty of Science, The University of Sydney, Camperdown, NSW, Australia
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Nishimori A, Hirose S, Ogino S, Andoh K, Isoda N, Sakoda Y. Endemic infections of bovine viral diarrhea virus genotypes 1b and 2a isolated from cattle in Japan between 2014 and 2020. J Vet Med Sci 2021; 84:228-232. [PMID: 34911882 PMCID: PMC8920713 DOI: 10.1292/jvms.21-0480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) is a causative agent of bovine viral diarrhea. In
Japan, a previous study reported that subgenotype 1b viruses were predominant until 2014.
Because there is little information regarding the recent epidemiological status of BVDV
circulating in Japan, we performed genetic characterization of 909 BVDV isolates obtained
between 2014 and 2020. We found that 657 and 252 isolates were classified as BVDV-1 and
BVDV-2, respectively, and that they were further subdivided into 1a (35 isolates, 3.9%),
1b (588, 64.7%), 1c (34, 3.7%), and 2a (252, 27.7%). Phylogenetic analysis using entire E2
coding sequence revealed that a major domestic cluster in Japan among BVDV-1b and 2a
viruses were unchanged from a previous study conducted from 2006 to 2014. These results
provide updated information concerning the epidemic strain of BVDV in Japan, which would
be helpful for appropriate vaccine selection.
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Affiliation(s)
- Asami Nishimori
- National Institute of Animal Health, National Agriculture and Food Research Organization
| | - Shizuka Hirose
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University
| | - Saho Ogino
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University
| | - Kiyohiko Andoh
- National Institute of Animal Health, National Agriculture and Food Research Organization
| | - Norikazu Isoda
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University
| | - Yoshihiro Sakoda
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University
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Transmission Dynamics of Bovine Viral Diarrhea Virus in Hokkaido, Japan by Phylogenetic and Epidemiological Network Approaches. Pathogens 2021; 10:pathogens10080922. [PMID: 34451386 PMCID: PMC8400418 DOI: 10.3390/pathogens10080922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/10/2021] [Accepted: 07/17/2021] [Indexed: 11/16/2022] Open
Abstract
Bovine viral diarrhea (BVD) caused by BVD virus (BVDV) leads to economic loss worldwide. Cattle that are persistently infected (PI) with BVDV are known to play an important role in viral transmission in association with the animal movement, as they shed the virus during their lifetime. In this research, the "hot spot" for BVD transmission was estimated by combining phylogenetic and epidemiological analyses for PI cattle and cattle that lived together on BVDV affected farms in Tokachi district, Hokkaido prefecture, Japan. Viral isolates were genetically categorized into BVDV-1a, 1b, and 2a, based on the nucleotide sequence of the entire E2 region. In BVDV genotype 1, subgenotype b (BVDV-1b), cluster I was identified as the majority in Tokachi district. Network analysis indicated that 12 of the 15 affected farms had cattle movements from other facilities (PI-network) and farms affected with BVDV-1b cluster I consisted of a large network. It was implied that the number of cattle movements themselves would be a risk of BVD transmission, using the PageRank algorithm. Therefore, these results demonstrate that cattle movements would contribute to disease spread and the combination of virological and epidemiological analysis methods would be beneficial in determining possible virus transmission routes.
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Gates MC, Evans CA, Weston JF. Practices and opinions of New Zealand veterinarians regarding control of bovine viral diarrhoea. N Z Vet J 2021; 69:274-284. [PMID: 33879036 DOI: 10.1080/00480169.2021.1920511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIMS To explore recommendations that New Zealand veterinarians make for diagnosing and managing bovine viral diarrhoea (BVD) in cattle herds under different clinical scenarios and their opinions towards potential barriers and opportunities for implementing BVD control programmes in New Zealand. METHODS A cross-sectional survey of registered veterinarians in New Zealand was conducted in 2019. Respondents were asked about the approaches they would use to manage BVD under different clinical scenarios as well as their opinions on national BVD control. A subset of veterinarians completed a more in-depth survey providing additional free-text responses on a range of different BVD topics. Descriptive statistics were provided for all quantitative study variables and the free-text responses were also analysed to generate further insights into veterinarians' perceptions towards BVD management. RESULTS The cross-sectional survey was completed by 101 of an estimated 870 (11.6%) cattle veterinarians. Thirty-five veterinarians completed the in-depth survey. There was wide variation in the BVD diagnostic testing and vaccination protocols that respondents recommended under different clinical scenarios. Annual bulk milk BVD testing was perceived as a valuable tool for initiating BVD discussions with dairy farmers. Respondents indicated that beef farmers were more difficult to engage in BVD control largely due to the logistical challenges of yarding cattle at the appropriate times to implement interventions, with many farmers only contacting veterinarians after experiencing a BVD outbreak Most respondents (91/101; 90%) believed it was possible to eradicate BVD from New Zealand, but cited lack of farmer awareness and poor compliance with management recommendations as significant barriers. The measure with the most support for inclusion in a compulsory national eradication programme was requiring farmers to declare the status of their animals prior to sale while the least supported measure was requiring farmers to double fence boundaries to prevent nose-to-nose contact with neighbouring stock. Although respondents highlighted the need for farmers and industry to support any national eradication programme in order for it to be successful, there was also recognition that veterinarians could be more pro-active in engaging with farmers particularly in discussions around the economics of BVD. CONCLUSIONS AND CLINICAL RELEVANCE While the survey respondents appeared to be highly supportive of BVD control, it was perceived that financial and logistical barriers existed that could impede farmer engagement. Further extension efforts may be needed to ensure that veterinarians are presenting clear and consistent recommendations about BVD management to farmers.Abbreviations: BVD: Bovine viral diarrhoea; NAIT: National Animal Identification and Tracing System; PI: Persistently infected.
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Affiliation(s)
- M C Gates
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - C A Evans
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - J F Weston
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
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Notsu K, Wiratsudakul A, Mitoma S, Daous HE, Kaneko C, El-Khaiat HM, Norimine J, Sekiguchi S. Quantitative Risk Assessment for the Introduction of Bovine Leukemia Virus-Infected Cattle Using a Cattle Movement Network Analysis. Pathogens 2020; 9:pathogens9110903. [PMID: 33126749 PMCID: PMC7693104 DOI: 10.3390/pathogens9110903] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/27/2020] [Accepted: 10/27/2020] [Indexed: 11/18/2022] Open
Abstract
The cattle industry is suffering economic losses caused by bovine leukemia virus (BLV) and enzootic bovine leukosis (EBL), the clinical condition associated with BLV infection. This pathogen spreads easily without detection by farmers and veterinarians due to the lack of obvious clinical signs. Cattle movement strongly contributes to the inter-farm transmission of BLV. This study quantified the farm-level risk of BLV introduction using a cattle movement analysis. A generalized linear mixed model predicting the proportion of BLV-infected cattle was constructed based on weighted in-degree centrality. Our results suggest a positive association between weighted in-degree centrality and the estimated number of introduced BLV-infected cattle. Remarkably, the introduction of approximately six cattle allowed at least one BLV-infected animal to be added to the farm in the worst-case scenario. These data suggest a high risk of BLV infection on farms with a high number of cattle being introduced. Our findings indicate the need to strengthen BLV control strategies, especially along the chain of cattle movement.
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Affiliation(s)
- Kosuke Notsu
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; (K.N.); (S.M.); (H.E.D.)
| | - Anuwat Wiratsudakul
- Department of Clinical Sciences and Public Health, Faculty of Veterinary Science, Mahidol University, Nakhon Pathom 73170, Thailand;
- The Monitoring and Surveillance Center for Zoonotic Diseases in Wildlife and Exotic Animals, Faculty of Veterinary Science, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Shuya Mitoma
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; (K.N.); (S.M.); (H.E.D.)
| | - Hala El Daous
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; (K.N.); (S.M.); (H.E.D.)
- Faculty of Veterinary Medicine, Benha University, Toukh 13736, Egypt;
| | - Chiho Kaneko
- Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan; (C.K.); (J.N.)
| | - Heba M. El-Khaiat
- Faculty of Veterinary Medicine, Benha University, Toukh 13736, Egypt;
| | - Junzo Norimine
- Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan; (C.K.); (J.N.)
- Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Satoshi Sekiguchi
- Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan; (C.K.); (J.N.)
- Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
- Correspondence: ; Tel.: +81-0985-58-7676
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Han JH, Weston JF, Heuer C, Gates MC. Modelling the economics of bovine viral diarrhoea virus control in pastoral dairy and beef cattle herds. Prev Vet Med 2020; 182:105092. [PMID: 32745776 DOI: 10.1016/j.prevetmed.2020.105092] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/25/2020] [Accepted: 07/10/2020] [Indexed: 11/26/2022]
Abstract
Bovine viral diarrhoea virus (BVDV) is a prevalent pathogen in the New Zealand cattle industries, yet few studies to date have evaluated the economics of BVDV in pastoral dairy and beef herds to help inform management decisions. To address this knowledge gap, we developed stochastic individual-based simulation models to represent the transmission dynamics of BVDV in typical spring-calving dairy and beef farms in New Zealand. The models conservatively estimated the direct losses due to a BVDV outbreak at NZ$ 22.22 and NZ$ 41.19 per mixed-age cow per year for a naïve dairy and beef farm, respectively, over a 5-year period. The greatest economic impacts for the dairy farm occurred when persistently infected replacement heifers joined the lactating cow group and caused transient infection of cows to drop in milk production, whereas the greatest impacts for the beef farm was through the loss of fattening stock for sale due to lowered pregnancy rates. Various combinations of diagnostic testing, vaccination, and biosecurity measures were then explored to evaluate the cost-efficiency of different strategies for controlling BVDV at the farm-level. Providing farmers with the estimates of economic impacts of BVDV in their herds may further encourage the uptake of control measures, but close collaboration with a veterinarian to determine the optimal strategy for their unique farm circumstances is still required.
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Affiliation(s)
- Jun-Hee Han
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand.
| | - Jenny F Weston
- School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
| | - Cord Heuer
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
| | - M Carolyn Gates
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
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Han JH, Weston JF, Heuer C, Gates MC. Estimation of the within-herd transmission rates of bovine viral diarrhoea virus in extensively grazed beef cattle herds. Vet Res 2019; 50:103. [PMID: 31783904 PMCID: PMC6884759 DOI: 10.1186/s13567-019-0723-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 11/06/2019] [Indexed: 11/12/2022] Open
Abstract
Many research groups have developed mathematical models to simulate the dynamics of BVDV infections in cattle herds. However, most models use estimates for within-herd BVDV transmission rates that are either based on expert opinion or adapted from other dairy herd simulation models presented in the literature. There is currently little information on the transmission rates for BVDV in extensively grazed beef herds partly due to the logistical challenges in obtaining longitudinal data of individual animal’s seroconversion, and it may not be appropriate to apply the same transmission rates from intensive dairy herds given the significant differences in herd demographics and management. To address this knowledge gap, we measured BVDV antibody levels in 15 replacement heifers in each of 75 New Zealand beef breeding farms after their first calving and again at pregnancy scanning or weaning to check for seroconversion. Among these, data from 9 farms were used to infer the within-herd BVDV transmission rate with an approximate Bayesian computation method. The most probable within-herd BVDV transmission rate was estimated as 0.11 per persistently infected (PI) animal per day with a 95% highest posterior density interval between 0.03 and 0.34. This suggests that BVDV transmission in extensively grazed beef herds is generally slower than in dairy herds where the transmission rate has been estimated at 0.50 per PI animal per day and therefore may not be sufficient to ensure that all susceptible breeding females gain adequate immunity to the virus before the risk period of early pregnancy for generating new PI calves.
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Affiliation(s)
- Jun-Hee Han
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand.
| | - Jenny F Weston
- School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
| | - Cord Heuer
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
| | - M Carolyn Gates
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11-222, Palmerston North, New Zealand
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Brock J, Lange M, More SJ, Graham D, Thulke HH. Reviewing age-structured epidemiological models of cattle diseases tailored to support management decisions: Guidance for the future. Prev Vet Med 2019; 174:104814. [PMID: 31743817 DOI: 10.1016/j.prevetmed.2019.104814] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 12/31/2022]
Abstract
Mechanistic simulation models are being increasingly used as tools to assist with animal health decision-making in the cattle sector. We reviewed scientific literature for studies reporting age-structured cattle management models in application to infectious diseases. Our emphasis was on papers dedicated to support decision making in the field. In this systematic review we considered 1290 manuscripts and identified 76 eligible studies. These are based on 52 individual models from 10 countries addressing 9 different pathogens. We provide an overview of these models and present in detail their theoretical foundations, design paradigms and incorporated processes. We propose a structure of the characteristics of cattle disease models using three main features: [1] biological processes, [2] farming-related processes and [3] pathogen-related processes. It would be of benefit if future cattle disease models were to follow this structure to facilitate science communication and to allow increased model transparency.
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Affiliation(s)
- Jonas Brock
- Helmholtz Centre for Environmental Research GmbH - UFZ, Dept Ecological Modelling, PG Ecological Epidemiology, Leipzig, Germany; Animal Health Ireland, Carrick-on-Shannon, Co. Leitrim, Ireland.
| | - Martin Lange
- Helmholtz Centre for Environmental Research GmbH - UFZ, Dept Ecological Modelling, PG Ecological Epidemiology, Leipzig, Germany
| | - Simon J More
- Centre for Veterinary Epidemiology and Risk Analysis, UCD School of Veterinary Medicine, University College Dublin, Dublin, Ireland
| | - David Graham
- Animal Health Ireland, Carrick-on-Shannon, Co. Leitrim, Ireland
| | - Hans-Hermann Thulke
- Helmholtz Centre for Environmental Research GmbH - UFZ, Dept Ecological Modelling, PG Ecological Epidemiology, Leipzig, Germany
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Agah MA, Notsu K, El-Khaiat HM, Arikawa G, Kubo M, Mitoma S, Okabayashi T, Mekata H, Elhanafy E, El Daous H, Mai TN, Nguyen TH, Isoda N, Sakoda Y, Norimine J, Sekiguchi S. Slaughterhouse survey for detection of bovine viral diarrhea infection among beef cattle in Kyushu, Japan. J Vet Med Sci 2019; 81:1450-1454. [PMID: 31378773 PMCID: PMC6863731 DOI: 10.1292/jvms.19-0045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Bovine viral diarrhea virus (BVDV) footprint has spread across the globe and is
responsible for one of the most economically important diseases in cattle. In Japan, some
regional surveillance and preventive measures to control bovine viral diarrhea (BVD) have
been implemented. However, BVDV infection is poorly understood in cattle industries, and
there is no systematic BVD surveillance system and control program. Kyushu is the center
for raising beef cattle in Japan. Therefore, this study aimed to determine the BVDV
infection using a slaughterhouse survey among beef cattle in Kyushu, Japan. A total of
1,075 blood samples were collected at two regional slaughterhouses in Miyazaki prefecture
from December 2015 to June 2016. Antigen ELISA was used for detection of BVDV antigen in
blood samples. Two samples showed positive results (2/1,075; 0.18%). BVDV RNA was
extracted from positive blood samples; the sequence was determined and analyzed by the
neighbor-joining method for construction of the phylogenetic tree. Phylogenetic analysis
based on the 5’-UTR revealed that the two positive samples were grouped into the same
subtype BVDV-1b in the BVDV-1 genotype, but the infected cattle belonged to two different
farms. In conclusion, this is the first study to identify the presence of BVDV in a
slaughterhouse survey in Kyushu. These findings suggest that a slaughterhouse survey is a
useful tool for developing a surveillance system for monitoring infectious diseases in
cattle.
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Affiliation(s)
- Mohammad Aref Agah
- Faculty of Agriculture, Badghis Higher Education Institution, Shogofan Farm street, Qala-i-now city, Badghis province, Badghis, Afghanistan.,Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Kosuke Notsu
- Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
| | - Heba M El-Khaiat
- Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Qalyubia, 13736, Egypt
| | - Genki Arikawa
- Miyakonojo Meat Inspection Office, Miyazaki 885-0021, Japan
| | - Meiko Kubo
- Miyakonojo Meat Inspection Office, Miyazaki 885-0021, Japan
| | - Shuya Mitoma
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, 5600, Kihara, Kiyotake-cho, Miyazaki, 889-1692, Japan
| | - Tamaki Okabayashi
- Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan.,Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Hirohisa Mekata
- Organization for Promotion of Tenure Track, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Eslam Elhanafy
- Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Qalyubia, 13736, Egypt.,Graduate School of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki, 889-2192, Japan
| | - Hala El Daous
- Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Qalyubia, 13736, Egypt.,Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, 5600, Kihara, Kiyotake-cho, Miyazaki, 889-1692, Japan
| | - Thi Ngan Mai
- Graduate School of Medicine and Veterinary Medicine, University of Miyazaki, 5600, Kihara, Kiyotake-cho, Miyazaki, 889-1692, Japan.,Faculty of Veterinary Medicine, Vietnam National University of Agriculture, Hanoi 100000, Vietnam
| | - Thi Huyen Nguyen
- Graduate School of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki, 889-2192, Japan
| | - Norikazu Isoda
- Research Center for Zoonosis Control, Hokkaido University, Sapporo, Hokkaido 001-0020, Japan
| | - Yoshihiro Sakoda
- Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Hokkaido 060-0818, Japan
| | - Junzo Norimine
- Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan.,Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan
| | - Satoshi Sekiguchi
- Department of Veterinary Science, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-2192, Japan.,Center for Animal Disease Control, University of Miyazaki, Miyazaki 889-2192, Japan
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12
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ISODA N, ASANO A, ICHIJO M, OHNO H, SATO K, OKAMOTO H, NAKAO S, KATO H, SAITO K, ITO N, USUI A, TAKAYAMA H, SAKODA Y. Assessment of the cost effectiveness of compulsory testing of introduced animals and bulk tank milk testing for bovine viral diarrhea in Japan. J Vet Med Sci 2019; 81:577-585. [PMID: 30828031 PMCID: PMC6483914 DOI: 10.1292/jvms.18-0671] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 02/18/2019] [Indexed: 11/22/2022] Open
Abstract
Bovine viral diarrhea (BVD) is a chronic disease of cattle caused by infection with BVD virus (BVDV) and can result in economic losses within the livestock industry. In Japan, the test and culling policy is a basic control measure, and implementation of an adequate vaccination program is recommended as a national policy. In addition, optional control measures, including compulsory testing of introduced animals and bulk tank milk (BTM) testing as a mass screening method, are used in several provinces, but their efficacy has not been completely assessed. We evaluated these control measures using the scenario tree model of BVD in Japan, developed in the previous study. The model outputs indicated that compulsory testing of all introduced cattle, rather than only heifers and/or non-vaccinated cattle, was cost effective and reduced the risk of BVDV introduction due to animal movement and that BTM testing could effectively monitor most part of the cattle population. Vaccination coverage and BVDV prevalence among introduced cattle could also affect the cost effectiveness of compulsory testing of targeted cattle, particularly under low vaccination coverage or high BVDV prevalence. However, even with the implementation of a highly effective monitoring scheme for many years, BVD risk could not be eliminated; it instead converged at a very low level (0.02%). Disease models with a cost-effective output could be a powerful tool in developing a control scheme for chronic animal diseases, including BVD, with the consent of relevant stakeholders.
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Affiliation(s)
- Norikazu ISODA
- Unit of Risk Analysis and Management, Research Center for
Zoonosis Control, Hokkaido University, Kita 20, Nishi 10, Kita-ku, Sapporo, Hokkaido
001-0020, Japan
- Global Station for Zoonosis Control, Global Institute for
Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Hokkaido
001-0020, Japan
| | - Akihiro ASANO
- Hokkaido Nemuro Livestock Hygiene Service Center, 69,
Betsukai-Midorimachi, Betsukai, Notsuke-gun, Hokkaido 086-0214, Japan
| | - Michiru ICHIJO
- Hokkaido Nemuro Livestock Hygiene Service Center, 69,
Betsukai-Midorimachi, Betsukai, Notsuke-gun, Hokkaido 086-0214, Japan
| | - Hiroshi OHNO
- Hokkaido Veterinary Medical Association Nemuro Branch, 119,
Betsukai-Midorimachi, Betsukai, Notsuke-gun, Hokkaido 086-0292, Japan
| | - Kazuhiko SATO
- Western Nemuro Operation Center, Hokkaido Higashi
Agricultural Mutual Aid Association, 109, Nishi-Syunbetsu, Betsukai, Notsuke-gun, Hokkaido
088-2576, Japan
| | - Hirokazu OKAMOTO
- Northern Nemuro Operation Center, Hokkaido Higashi
Agricultural Mutual Aid Association, 37, Tawara-bashi 14, Naka-shibetsu, Sibetsu-gun,
Hokkaido 086-1137, Japan
| | - Shigeru NAKAO
- Southern Nemuro Operation Center, Hokkaido Higashi
Agricultural Mutual Aid Association, 119, Betsukai-Midorimachi, Betsukai, Notsuke-gun,
Hokkaido 086-0292, Japan
| | - Hajime KATO
- Southern Nemuro Operation Center, Hokkaido Higashi
Agricultural Mutual Aid Association, 119, Betsukai-Midorimachi, Betsukai, Notsuke-gun,
Hokkaido 086-0292, Japan
| | - Kazuma SAITO
- Betsukai Town Office, 280, Betsukai-Tokiwa, Betsukai,
Notsuke-gun, Hokkaido 086-0205, Japan
| | - Naoki ITO
- The Federation of Agricultural Cooperatives in Nemuro, 2,
Higashi 1, Minami 1, Naka-shibetsu, Sibetsu-gun, Hokkaido 086-1006, Japan
| | - Akira USUI
- Hokkaido Veterinary Medical Association Nemuro Branch, 119,
Betsukai-Midorimachi, Betsukai, Notsuke-gun, Hokkaido 086-0292, Japan
| | - Hiroaki TAKAYAMA
- Hokkaido Nemuro Livestock Hygiene Service Center, 69,
Betsukai-Midorimachi, Betsukai, Notsuke-gun, Hokkaido 086-0214, Japan
| | - Yoshihiro SAKODA
- Global Station for Zoonosis Control, Global Institute for
Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Hokkaido
001-0020, Japan
- Laboratory of Microbiology, Department of Disease Control,
Faculty of Veterinary Medicine, Hokkaido University, Kita 18, Nishi 9, Kita-ku, Sapporo,
Hokkaido 060-0018, Japan
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