Staff Publications

Staff Publications

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    '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.

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Supply chain environmental management
Grekova, E. ; Trienekens, J.H. ; Bremmers, H.J. ; Heres, L. ; Omta, S.W.F. - \ 2014
In: Quality and risk management in agri-food chains / Petersen, Brigitte, Nüssel, Manfred, Hamer, Martin, Wageningen : Wageningen Academic Publishers - ISBN 9789086862368 - p. 168 - 172.
Approaches to reduce antibiotic resistance in the pork supply chain
Heres, L. ; Dusseldorf, S. ; Oorburg, D. ; Urlings, H.A.P. - \ 2013
In: Book of Abstracts of the 64th Annual Meeting of the European Federation of Animal Science, 26-30 August 2013, Nantes, France. - Wageningen : Wageningen Academic Publishers - ISBN 9789086862283 - p. 218 - 218.
Implementierung einer risikoorientierten Fleischuntersuchung ohne Anschnitte beim Mastschwein in einem nord-deutschen Schlachtunternehmen
Hiller, A. ; Heres, L. ; Schulze Althoff, G. ; Urlings, H.A.P. ; Klein, G. - \ 2012
Archiv für Lebensmittelhygiene 63 (2012)4. - ISSN 0003-925X - p. 107 - 114.
pathogenic yersinia-enterocolitica - food-chain information - consequences - respect - safety - pork
Regulation (EC) 854/2004 opens up the opportunity to implement risk based meat inspection of fattening pigs without incision. A concept for implementation of a food safety improving meat inspection without incision was approved in practice and evaluated. It includes a serological monitoring for categorising pig herds according to the risk related to food safety concerning Mycobacterium ovum, a specific test to detect residues of antimicrobial substances and to fulfill the criteria of Regulation (EC) 1244/2007. The concept is suitable for practical implementation. In comparison to the traditional meat inspection system the new system enables control of food safety hazards on farm level. Omitting of incision of the mandibular lymph nodes showed a significant reduction in the cross contamination of Salmonella.
Livestock-associated MRSA ST398 carriage in pig slaughterhouse workers related to quantitative environmental exposure
Gilbert, M.J. ; Bos, M.E.H. ; Duim, B. ; Urlings, H.A.P. ; Heres, L. ; Wagenaar, J.A. ; Heederik, D.J.J. - \ 2012
Occupational and Environmental Medicine 69 (2012)7. - ISSN 1351-0711 - p. 472 - 478.
resistant staphylococcus-aureus - time pcr assay - methicillin-resistant - high prevalence - netherlands - endocarditis - infections - personnel - bacteria - contact
Objectives To assess livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) carriage among workers in pig slaughterhouses and assess associated risk factors, including occupational exposure to LA-MRSA. Methods A cross-sectional study in three Dutch pig slaughterhouses was undertaken. Nasal swabs of participants were taken. Nasal swabs and surface wipes, air and glove samples were screened for presence of methicillin-resistant Staphylococcus aureus (MRSA). MRSA was quantitatively determined on gloves and in air samples by culturing and real-time PCR. Results 11 of 341 (3.2%) participants were identified as nasal MRSA carriers. MRSA-positive workers were predominantly found at the start of the slaughter process. Major risk factors for carriage were working in the lairage and working in the scalding and dehairing area. Most nasal isolates (73%) belonged to the LA-MRSA clone ST398. MRSA ST398-positive environmental samples were found throughout the slaughter process. A clear decrease was seen along the slaughterline in the number of MRSA-positive samples and in the MRSA amount per sample. Conclusions This study showed that working in the lairage area or scalding and dehairing area were the major risk factors for MRSA carriage in pig slaughterhouse workers, while the overall prevalence of MRSA carriage is low. Occupational exposure to MRSA decreased along the slaughterline, and the risk of carriage showed a parallel decrease.
A human nose scoring system for boar taint and its relationship with androstenone and skatole
Mathur, V. ; Napel, J. ten; Bloemhof, S. ; Heres, L. ; Knol, E.F. ; Mulder, H.A. - \ 2012
Meat Science 91 (2012)4. - ISSN 0309-1740 - p. 414 - 422.
7 european countries - correlation-coefficient - perceive androstenone - sensory evaluation - sex odor - pork - meat - sensitivity - consumers - acceptability
A system for sensory evaluation of boar taint was used to evaluate boar taint in fat samples from 6574 entire males. The term “human nose scoring” has been used to describe this system. The samples from each boar were heated with a hot iron and three panelists assigned scores of 0 to 4. The reproducibility of HNS ranged from 0.19 to 0.32 reflecting natural variation in the ability of human beings to detect different odors. The correlations of HNS with androstenone ranged from 0.22 to 0.52, while those with skatole ranged from 0.31 to 0.89, suggesting that skatole is a better predictor of boar taint. Considering (1) the relationship of HNS with the boar taint compounds, (2) the ability of HNS to capture variation not accounted for by the boar taint compounds, (3) low estimation costs and (4) low time requirements, HNS can be used in large scale evaluations of boar taint.
Case studies: Tuberculination in pig herds suspected of infection with Mycobacterium avium
Oorburg, D. ; Wisselink, H.J. ; Smits, C.B. ; Hiller, A. ; Heres, L. ; Urlings, Bert - \ 2011
In: 65th International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork. -
Isolation of immunogenic glycopeptidolipids of Mycobacterium avium subsp. hominissuis
Wisselink, H.J. ; Abou, N. ; Solt-Smits, C.B. van; Heres, L. ; Willemsen, P. - \ 2010
In: The 21st International Pig Veterinary Society (IPVS) Congress, 18 - 21 July, 2010, Vancouver, Canada. - s.n. - p. 181 - 181.
Entire males - challenges and opportunities
Klont, R.E. ; Kurt, E. ; Heres, L. ; Urlings, H.A.P. - \ 2010
Fleischwirtschaft International 25 (2010)2. - ISSN 0179-2415 - p. 59 - 63.
Die produktion nicht kastrierter Eber-Herausforderungen und chancen
Klont, R.E. ; Kurt, E. ; Heres, L. ; Urlings, H.A.P. - \ 2010
Fleischwirtschaft 90 (2010)2. - ISSN 0015-363X - p. 107 - 109.
Vorteile der Produktion nicht kastrierter Eber werden gesteigertes Wohlbefinden der Schweine, höhere Produktionseffizienz für Produzenten und eine bessere Wahrnehmung durch die Verbraucher sein. Die Produktion nicht kastrierter Eber setzt die Möglichkeit voraus, andere Verarbeitungswege für Produkte mit Ebergeruch zu entdecken und zu finden, sowie eine internationale Akzeptanz von Produktionssystemen mit nicht kastrierten Ebern. Dieses Papier fasst die Möglichkeiten zusammen, zu vermeiden, dass Schweinefleisch mit abweichendem Geruch den Verbraucher erreicht, indem 1) Ebergeruch im lebenden Tier verhindert und verringert wird, und 2) Tierkörper mit abweichendem Geruch und die Verwendung von Produkten mit abweichendem Geruch in weiterverarbeitetem Fleisch erkannt werden. Eine erhebliche Verringerung ist möglich durch genetische Selektion, Futter- und Hofmanagement. Dies wird einige Zeit dauern und nicht zu Produkten führen, die zu 100% frei von Ebergeruch sind. Eine international anerkannte und zuverlässige Erkennungsmethode am Schlachtband in den Fleischverarbeitungswerken steht noch nicht zur Verfügung, wird aber untersucht. Die Produktion nicht kastrierter Eber bietet eine großartige Gelegenheit für die Zukunft, aber in der Zwischenzeit ist die Kastration bei minimalen Schmerzen ein gangbarer Weg.
Tracing and analytical results of the dioxin contamination incident in 2008 originating from the Republic of Ireland
Heres, L. ; Hoogenboom, R. ; Herbes, R. ; Traag, W.A. ; Urlings, H.A.P. - \ 2010
Food Additives & Contaminants. Pt. A, Chemistry, Analysis, Control, Exposure & Risk Assessment 27 (2010)12. - ISSN 1944-0049 - p. 1733 - 1744.
long-evans rats - 2,3,7,8-tetrachlorodibenzo-p-dioxin tcdd - exposure
High levels of dioxins (PCDD/Fs) in pork were discovered in France and the Netherlands at the end of 2008. The contamination was rapidly traced back to a feed stock in the Republic of Ireland (RoI). Burning oil, used for the drying of bakery waste, appeared to be contaminated with PCBs. Consequently, very high levels up to 500 pg TEQ g-1 fat were found in pork. The congener pattern clearly pointed to PCB-oil as a source, but the ratio between the non-dioxin-like indicator PCBs (PCBs 28, 52, 101, 138, 152 and 180) and PCDD/Fs was much lower than observed during the Belgian incident, thereby limiting the suitability of indicator PCBs as a marker for the presence of dioxins and dioxin-like PCBs. This paper describes the tracking and tracing of the incident, the public-private cooperation, the surveillance activities and its results. A major lesson to be learned from this incident is the importance of good private food safety systems. In this incident, it was the private surveillance systems that identified the origin of contamination within 10 days after the first signal of increased dioxin levels in a product. On the other hand, retrospective analyses showed that signals were missed that could have led to an earlier detection of the incident and the source. Above all, the incident would not have occurred when food safety assurance systems had been effectively implemented in the involved feed chain. It is discussed that besides primary responsibility for effective private food safety systems, the competent authorities have to supervise whether the food safety procedures are capable of coping with these kinds of complex food safety issues, while private food companies need to implement the law, and public authorities should supervise and enforce them. Finally, it is discussed whether the health risks derived from consumption of the contaminated batches of meat may have been underestimated during the incident due to the unusually high intake of dioxins. Keywords: traceability; risk assessment; screening assays; regulations; dioxins; TEQs; PCBs; meat; animal feed; animal products; ingredients
The BSE Risk of Processing Meat and Bone Meal in Nonruminant Feed: A Quantitative Assessment for the Netherlands
Vos, C.J. de; Heres, L. - \ 2009
Risk Analysis 29 (2009)4. - ISSN 0272-4332 - p. 541 - 557.
bovine spongiform encephalopathy - great-britain - transmission dynamics - cattle - infection - exposure - agents - epidemiology - impact - inactivation
The total ban on use of meat and bone meal (MBM) in livestock feed has been very successful in reducing bovine spongiform encephalopathy (BSE) spread, but also implies a waste of high-quality proteins resulting in economic and ecological loss. Now that the BSE epidemic is fading out, a partial lifting of the MBM ban might be considered. The objective of this study was to assess the BSE risk for the Netherlands if MBM derived from animals fit for human consumption, i.e., category 3 MBM, would be used in nonruminant feed. A stochastic simulation model was constructed that calculates (1) the probability that infectivity of undetected BSE-infected cows ends up with calves and (2) the quantity of infectivity (Qinf) consumed by calves in case of such an incident. Three pathways were considered via which infectivity can reach cattle: (1) cross-contamination in the feed mill, (2) cross-contamination on the primary farm, and (3) pasture contamination. Model calculations indicate that the overall probability that infectivity ends up with calves is 3.2%. In most such incidents the Qinf is extremely small (median = 6.5 × 10¿12 ID50; mean = 1.8 × 10¿4 ID50), corresponding to an average probability of 1.3 × 10¿4 that an incident results in ¿1 new BSE infections. Cross-contamination in the feed mill is the most risky pathway. Combining model results with Dutch BSE prevalence estimates for the coming years, it can be concluded that the BSE risk of using category 3 MBM derived from Dutch cattle in nonruminant feed is very low
Clinical symptoms reported and decrease in milk production of BSE affected cows detected by active surveillance in The Netherlands
Heres, L. ; Elbers, A.R.W. ; Zijderveld, F.G. van - \ 2008
Sheep flocks in Lelystad with and without natural scrapie infection
Heres, L. ; Langeveld, J.P.M. ; Keulen, L. van; Bossers, A. - \ 2008
Feed producers and their MBM, the single risk factor for BSE in The Netherlands
Heres, L. ; Zijderveld, F.G. van - \ 2008
BSE in The Netherlands: 15 years of surveillance
Zijderveld, F.G. van; Heres, L. ; Davidse, A. ; Bossers, A. ; Langeveld, J.P.M. ; Keulen, L.J.M. van - \ 2008
TSE surveillance in sheep in The Netherlands
Zijderveld, F.G. van; Heres, L. ; Davidse, A. ; Bossers, A. ; Langeveld, J.P.M. ; Keulen, L.J.M. van - \ 2008
Spatial analysis of BSE cases in the Netherlands
Heres, L. ; Brus, D.J. ; Hagenaars, T.H.J. - \ 2008
Spatial analysis of BSE cases in the Netherlands
Heres, L. ; Brus, D.J. ; Hagenaars, T.H.J. - \ 2008
BMC Veterinary Research 4 (2008). - ISSN 1746-6148
bovine spongiform encephalopathy - great-britain - feed ban - risk-factors - temporal aspects - british cattle - bone meal - france - epidemic - transmission
Background: In many of the European countries affected by Bovine Spongiform Encephalopathy (BSE), case clustering patterns have been observed. Most of these patterns have been interpreted in terms of heterogeneities in exposure of cattle to the BSE agent. Here we investigate whether spatial clustering is present in the Dutch BSE case data. Results: We have found three spatial case clusters in the Dutch BSE epidemic. The clusters are geographically distinct and each cluster appears in a different birth cohort. When testing all birth cohorts together, only one significant cluster was detected. The fact that we found stronger spatial clustering when using a cohort-based analysis, is consistent with the evidence that most BSE infections occur in animals less than 12 or 18 months old. Conclusion: Significant spatial case clustering is present in the Dutch BSE epidemic. The spatial clusters of BSE cases are most likely due to time-dependent heterogeneities in exposure related to feed production.
Determination of Interpretive Criteria for Susceptibility Tests for Campylobacter spp
Mevius, D.J. ; Veldman, K.T. ; Pelt, W. van; Heres, L. ; Mulder, B. ; Wagenaar, J. - \ 2007
Quantitative assessment of the BSE risk from processing meat and bone meal in feed for non-ruminants in the Netherlands
Vos, C.J. de; Heres, L. - \ 2007
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