55 Attitudes and perceptions of Dutch veterinarians on their role in the reduction of antimicrobial use in farm animals (Research paper; Speksnijder, 2015)

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Significant Impact Group(s): Prudent use AB \ Veterinarian
Species targeted: Pigs; Poultry; Dairy; Beef; Sheep;
Age: Young; Adult;
Outcome Parameter(s): Reduced AMU
Summary: A questionnaire to understand veterinary attitudes towards prescribing antibiotics found veterinarians working across species were comparable in their opinions towards the Dutch policy to halve veterinary antibiotic consumption. Less experienced veterinarians and those working with ruminants reported difficulty resisting farmers’ or colleagues’ demands for antibiotics compared with veterinarians working with pigs/poultry/veal. Contrastingly, more experience was associated with being less concerned about the contribution of veterinarians to antimicrobial resistance, considering it more important to keep the right to prescribe and sell antibiotics. The main perceived reasons for non-compliance with veterinary advice by farmers were related to finances and time, although pig/poultry/veal veterinarians highlighted conflicting advice from other advisors as a cause for non-compliance. This study suggests that less experienced veterinarians might require support to resist pressure from farmers/colleagues. Additionally, experienced veterinarians could be educated about overuse of antibiotics. Alternative approaches should be identified for veterinarians to preserve an income from advising and to prevent contradictory advice being a barrier.
55 Research paper – Speksnijder – 2015 – Attitudes and perceptions of Dutch veterinarians on their role in the reduction of antimicrobial use in farm animals
Where to find the original material:
https://www.sciencedirect.com/science/article/pii/S0167587715300039; https://doi.org/10.1016/j.prevetmed.2015.08.014
Country: NL

55 Research paper – Speksnijder – 2015 – Attitudes and perceptions of Dutch veterinarians on their role in the reduction of antimicrobial use in farm animals

Risk factors for ESBL-producing Escherichia coli on pig farms: A longitudinal study in the context of reduced use of antimicrobials (Research paper; Dohmen, 2017)

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Significant Impact Group(s): Prudent use AB \ Farmer ; Biosecurity
Species targeted: Pigs;
Age: Young; Adult;
Outcome Parameter(s): Presence of ESBL-E. coli; antimicrobial use; cephalosporin use at the farm
Summary: This study determined prevalence of ESBL-E. coli on pig farms and the effect of reducing veterinary antimicrobial use (AMU) and farm management practices on ESBL-E. coli occurrence on pig farms. During 2011 and 2013, 36 Dutch conventional pig farms participated in a longitudinal study (4 sampling times in 18 months). The number of farms with ESBL-E. coli carrying pigs decreased from 16 to 10 and the prevalence of ESBL-E. coli-positive pig samples halved from 27% to 13%.
The presence of ESBL-E. coli carrying pigs was not related to total AMU, but it was strongly determined by the presence or absence of cephalosporin use at the farm. Other farm management factors, related with improved biosecurity, were less frequently seen in ESBL-E. coli-positive farms (e.g. presence of a hygiene lock, pest control delivered by a professional). In conclusion, ESBL-E. coli prevalence decreased in pigs during 2011 and 2013 in the Netherlands.
54 Research paper – Dohmen – 2017 – Risk factors for ESBL-producing Escherichia coli on pig farms_A longitudinal study in the context of reduced use of antimicrobial
Where to find the original material:
http://dspace.library.uu.nl/bitstream/handle/1874/359723/journal.pone.0174094.pdf?sequence=1&isAllowed=y; https://doi.org/10.1371/journal.pone.0174094
Country: NL

54 Research paper – Dohmen – 2017 – Risk factors for ESBL-producing Escherichia coli on pig farms_A longitudinal study in the context of reduced use of antimicrobial

53 Prevalence and risk factors for extended-spectrum β-lactamase- and AmpC-producing Escherichia coli in dairy farms

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Significant Impact Group(s): AMU reduction strategies \ Legislation and incentives
Species targeted: Dairy;
Age: Adult;
Outcome Parameter(s): herd-level prevalence of ESBL- and AmpC-producing E. coli
Summary: This study estimated the herd-level prevalence of antimicrobial resistant bacteria, specifically ESBL- and AmpC-producing E. coli among Dutch dairy farms. No association was found between the total AMU and the ESBL/AmpC herd status. The use of third- and fourth-generation cephalosporins, however, was associated with an increased odds of having a positive ESBL/AmpC herd status and seems important in reducing ESBL/AmpC. Four other management factors were also found to be associated with the ESBL/AmpC status of dairy herds: treatment of all cases of clinical mastitis with antimicrobials, a higher proportion of calves treated with antimicrobials, not applying teat sealants in all cows at dry off, and the use of a floor scraper (which is probably not a true risk factor). Also ESBL/AmpC could frequently be cultured from slurry samples collected from Dutch dairy farms.
53 Research paper – Gonggrijp – 2016 – Prevalence and risk factors for extended-spectrum b-lactamase- and AmpC-producing Escherichia coli in dairy
Where to find the original material:
https://www.sciencedirect.com/science/article/pii/S0022030216306257; https://doi.org/10.3168/jds.2016-11134
Country: NL

53 Research paper – Gonggrijp – 2016 – Prevalence and risk factors for extended-spectrum b-lactamase- and AmpC-producing Escherichia coli in dairy

51 Effects of Reducing Antimicrobial Use and Applying a Cleaning and Disinfection Program in Veal Calf Farming: Experiences from an Intervention Study to Control Livestock-Associated MRSA (Research paper; Dorado-Garcia, 2015)

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Significant Impact Group(s): AMU reduction strategies ; Biosecurity
Species targeted: Dairy;
Age: Young;
Outcome Parameter(s): decrease in MRSA prevalence
Summary: A Dutch policy was set in place in 2010 promoting a reduction of antimicrobial use (AMU) in food-producing animals. In this context, a study evaluated 2 different strategies: a. with reducing of antimicrobials and b. with reduction of antimicrobials and with a cleaning and disinfection program. These results suggest that AMU reduction might be a good strategy for reducing MRSA in veal calf farming, however the effect of the cleaning and disinfection protocol used in this study was not effective. The study indicates that the long term AMU decrease is likely to lower MRSA levels in people living and/or working in veal farms.
51 Research paper – Dorado-García – 2015 – Effects of Reducing Antimicrobial Use and Applying a Cleaning and Disinfection Program in Veal Calf Farming
Where to find the original material:
https://journals.plos.org/plosone/article/file?type=printable&id=10.1371/journal.pone.0135826; https://doi.org/10.1371/journal.pone.0135826
Country: NL

51 Research paper – Dorado-García – 2015 – Effects of Reducing Antimicrobial Use and Applying a Cleaning and Disinfection Program in Veal Calf Fa

50 Determinants Associated with Veterinary Antimicrobial Prescribing in Farm Animals in the Netherlands: A Qualitative Study (Research paper; Speksnijder, 2014)

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Significant Impact Group(s): Prudent use AB \ Veterinarian
Species targeted: Pigs; Poultry; Dairy; Beef; Sheep;
Age: Young; Adult;
Outcome Parameter(s): Reduced AMU
Summary: Veterinarians are responsible for prescribing and overseeing antimicrobial use (AMU) in animals. An understanding of veterinarians’ prescribing practices can help to design interventions to reduce AMU in farming. This Dutch study identified factors that influence farm veterinarian prescribing. Research interviews with eleven farm veterinarians were conducted and analysed. There were many conflicting interests identified regarding antimicrobial prescribing by veterinarians. A veterinarian’s professional obligation to reduce animal suffering, financial dependency on clients, risk avoidance, concerns about own skills, lack of farmers’ compliance to veterinary recommendations, public health interests and personal beliefs regarding their contribution to AMR, were found to be factors in antimicrobial prescribing behaviour of farm veterinarians. Interventions to change prescribing behaviour could address veterinary attitudes, advisory skills and provide tools to deal with (perceived) pressure from farmers to prescribe antimicrobials. Policy measures could support farm veterinarians to shift to a more independent animal health consultant role.
50 Research paper – Speksnijder – 2014 – Determinants Associated with Veterinary Antimicrobial Prescribing in Farm Animals in the Netherlands_ A Qualitative Study
Where to find the original material:
https://onlinelibrary.wiley.com/doi/full/10.1111/zph.12168; https://doi.org/10.1111/zph.12168
Country: NL

50 Research paper – Speksnijder – 2014 – Determinants Associated with Veterinary Antimicrobial Prescribing in Farm Animals in the Netherlands_ A Qualitative Study

48 Economic optimization of selective dry cow treatment (Research paper; Scherpenzeel, 2018)

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Significant Impact Group(s): Pathogen management \ Managing sick animals \ Targeted use of antibiotics ; AMU reduction strategies
Species targeted: Dairy;
Age: Adult;
Outcome Parameter(s): Udder health status
Summary: The goal of this study was to identify a scenario with the lowest costs for mastitis associated with the dry period while restricting the percentage of cows that need to be dried off with dry cow antimicrobials. The costs of clinical/subclinical mastitis and the antimicrobial use were quantified. The economic impact of reducing the percentage of clinical mastitis was found to be much larger than reducing the bulk tank somatic cell count. The optimal percentage of cows to be dried off with antimicrobials depends on the udder health situation, expressed as the bulk tank somatic cell count and the occurrence of clinical mastitis. Selective dry cow treatment was economically more beneficial than blanket dry cow treatment, for all types of herds studied. Economic profits of selective dry cow treatment are greater if bulk tank somatic cell count and clinical mastitis incidence are lower.
48 Research paper – Scherpenzeel – 2018 – Economic optimization of selective dry cow treatment
Where to find the original material:
https://www.sciencedirect.com/science/article/pii/S0022030217311098; https://doi.org/10.3168/jds.2017-13076
Country: NL

48 Research paper – Scherpenzeel – 2018 – Economic optimization of selective dry cow treatment

41 Reduction of Veterinary Antimicrobial Use in the Netherlands. The Dutch Success Model (Research paper; Speksnijder, 2014)

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Significant Impact Group(s): AMU reduction strategies \ Legislation and incentives; Government ; Prudent use AB
Species targeted: Pigs; Poultry; Dairy; Beef; Sheep;
Outcome Parameter(s): Reduced AMU; Decrease in the use of antimicrobials [defined doses per animal year (DDD/Y)]
Summary: Veterinary overuse of antimicrobials contributes to the selection and spread of antimicrobial resistance which poses a public health risk. A series of events and discoveries of significant reservoirs of antimicrobial resistant pathogens in the Netherlands resulted in a successful collaboration between government and stakeholders to reduce antimicrobial use in farm animals. Total use of antimicrobials in farm animals in the Netherlands decreased with 56% in the period 2007–2012. A combination of compulsory and voluntary measures and reduction goals resulted in this decrease.
41 Research paper – Speksnijder – 2014 – Reduction of Veterinary Antimicrobial Use in the Netherlands_The Dutch Success Model
Where to find the original material:
https://onlinelibrary.wiley.com/doi/full/10.1111/zph.12167; https://doi.org/10.1111/zph.12167
Country: NL

41 Research paper – Speksnijder – 2014 – Reduction of Veterinary Antimicrobial Use in the Netherlands_The Dutch Success Model

27 Quantitative assessment of antimicrobial resistance in livestock during the course of a nationwide antimicrobial use reduction in the Netherlands (Research paper; Dorado-Garcia, 2016)

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Significant Impact Group(s): AMU reduction strategies \ Monitoring and surveillance \ Antibiotic use
Species targeted: Pigs; Poultry; Dairy;
Age: Different for different species;
Outcome Parameter(s): Antimicrobial resistance
Summary: Evidence presented indicates that drug use history and co-selection of resistance are key elements
for perpetuation of resistance. Data suggest that recent Dutch policies aimed at reducing total use of antimicrobials and restricting the use of critically important antimicrobials have decreased E. coli resistance in the pig and veal calf production sectors while the impact on the dairy cattle and poultry sectors is less clear.
27 Research paper – Dorado-García – 2016 – Quantitative assessment of antimicrobial resistance in livestock during the course of a nationwide antimicrobi
Where to find the original material:
https://academic.oup.com/jac/article/71/12/3607/2631265; https://doi.org/10.1093/jac/dkw308
Country: NL

27 Research paper – Dorado-García – 2016 – Quantitative assessment of antimicrobial resistance in livestock during the course of a nationwide antimicrobi

20 Cider vinegar in water by Mr Wijnen (Farm Innovation)

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Significant Impact Group(s): Water \ Water additives ; Specific alternatives

Species targeted: Poultry;
Age: Young; Adult;
Outcome Parameter(s): vital chicks
Summary: The story of one farmer: Using apple cider vinegar in drinkingwater of chickens lowers use of antibiotics.
“It is nonsense that the animals should be given antibiotics to stay healthy.”
Story of one poultry farmer.
20 Farm Innovation – Cider vinegar in water by Mr Wijnen
Where to find the original material: (in Dutch)
https://www.boerderij.nl/Pluimveehouderij/Achtergrond/2010/4/Gezonde-kuikens-met-appelazijn-BOE011309W/;
Country: NL

20 Farm Innovation – Cider vinegar in water by Mr Wijnen

5 Enriched Housing Reduces Disease Susceptibility to Co-infection with Porcine Reproductive and Respiratory Virus (PRRSV) and Actinobacillus pleuropneumoniae (Research paper; Van Dixhoorn, 2016)

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5 Research paper

Enriched Housing Reduces Disease Susceptibility to Co-Infection with Porcine Reproductive and Respiratory Virus (PRRSV) and Actinobacillus pleuropneumoniae (A. pleuropneumoniae) in Young Pigs by van Dixhoorn, I.D.E., Reimert, I., Middelkoop, J., Bolhuis, E.J., Wisselink, H.J., Groot Koerkamp, P.W.G., Kemp, B., and N. Stockhofe-Zurwieden, 2016 PLOS ONE 11: 24p.
in Significant Impact Group(s): Housing and welfare \ Enrichment

Species targeted: Pigs;
Age: Young;
Outcome Parameter(s): Lower disease susceptibility to PRRSV and A. pleuropneumoniae; Improved welfare
Summary: Stress can reduce the ability of the immune system to fight disease, increasing an animal’s susceptibility to infection. Interventions that reduce stress may have positive effects on an animal’s immune system. This study investigated the effect of social and environmental enrichment on the impact of disease in pigs that were infected with PRRS virus and A. pleuropneumoniae bacteria. They compared groups of pigs housed in enriched pens to groups housed in barren pens. Enriched housed (EH) pigs showed faster clearance of the virus in blood and had less lung damage from infection – barren housed (BH) pigs had more lung lesions and tissue damage than EH pigs. EH pigs showed less stress-related
behaviour and differed immunologically and clinically from BH pigs. The research concluded that enriched housing reduces disease susceptibility to PRRSV and A. pleuropneumoniae in pigs. Enrichment positively influences behaviour, immune response and clinical outcomes in pigs. Until today, antimicrobial drugs have been the therapy of choice to combat bacterial diseases. Resistance against antibiotics is of growing concern in man and animals. Stress, caused by demanding environmental conditions, can reduce immune protection in the host, influencing the onset and outcome of infectious diseases. Therefore psychoneuro-immunological intervention may prove to be a successful
approach to diminish the impact of diseases and antibiotics use. This study was designed to investigate the effect of social and environmental enrichment on the impact
of disease, referred to as “disease susceptibility”, in pigs using a co-infection model of PRRSV and A. pleuropneumoniae. Twenty-eight pigs were raised in four pens under barren conditions and twenty-eight other pigs were raised in four pens under enriched conditions. In the enriched pens a combination of established social and environmental enrichment factors were introduced. Two pens of the barren (BH) and two pens of the enriched housed (EH) pigs were infected with PRRSV followed by A. pleuropneumoniae, the other two pens in each housing treatment served as control groups. We tested if differences in disease susceptibility in terms of pathological and clinical outcome were related to the
different housing regimes and if this was reflected in differences in behavioural and immunological states of the animals. Enriched housed pigs showed a faster clearance of viral PRRSV RNA in blood serum (p = 0.014) and histologically 2.8 fold less interstitial pneumonia signs in the lungs (p = 0.014). More barren housed than enriched housed pigs developed lesions in the lungs (OR = 19.2, p = 0.048) and the lesions in the barren housed pigs showed a higher total pathologic tissue damage score (p<0.001) than those in
enriched housed pigs. EH pigs showed less stress-related behaviour and differed immunologically and clinically from BH pigs. We conclude that enriched housing management reduces disease susceptibility to co-infection of PRRSV and A. pleuropneumoniae in pigs. Enrichment positively influences behavioural state, immunological response and clinical outcome in pigs. In our study, the enrichment stimulated the EH pigs psychologically differently as compared to the barren housed pigs and diminished (chronic) stress in the animals. Chronic stress in general is considered a potential influencing factor on disease susceptibility, however the complex pathways that mediate the effects of stress on infectious diseases, are not completely understood [1]. The better psycho-physiological and immunological state of the EH pigs likely positively affected their immune and inflammatory responses [67–71], and in this way, diminished the clinical manifestation. Our results are also in line with the increasing epidemiological evidence in humans and other species that environmentally induced adaptations, occurring at crucial stages of life, can potentially change behaviour, disease susceptibility and survival also known as the ‘early origins of
the adult disease susceptibility’ hypothesis [4, 72]. In conclusion, enriched rearing leads to a less severe onset and outcome of a PRRSV A. pleuropneumoniae co-infection. The enriched housed pigs showed a remarkably reduced impact of infection and were less prone to develop clinical signs of disease. We found more support for implementation of
psychoneuro-immunological intervention strategies to reduce the impact of infectious diseases and by this reducing antibiotics use. Future research should investigate the possible involved explanatory pathophysiological pathways.
5 Research paper – van Dixhoorn – 2016 – Enriched Housing Reduces Disease Susceptibility to Co-Infection with Porcine Repro
Where to find the original material:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5015855/;
https://doi.org/10.1371/journal.pone.0161832
Country: NL

 

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