Publications
2025
Scholarly publications
Wessels, W., Bokkers, E. A. M., de Boer, I. J. M., Meijer, E., Rodenburg, B., Hostens, M., & Koop, G. (2025). A systematic review and meta-analysis of lameness scoring methods and the prevalence of lameness and claw disorders of dairy cows in North-West Europe. 333. Abstract from ISAE Congress 2025, Utrecht, Netherlands. [Portal]
Wessels, W., Bokkers, E. A. M., de Boer, I. J. M., Meijer, E., Rodenburg, T. B., Hostens, M., & Koop, G. (2025). A systematic review and meta-analysis of lameness scoring methods and the prevalence of lameness of dairy cows in Northwest Europe. Journal of Dairy Science, 108(9), 10037-10059. [DOI] [Portal]
2024
Scholarly publications
de Geus, Y., Scherpenisse, P., Smit, L. A. M., Bossers, A., Stegeman, J. A., Benedictus, L., Spieß, L., & Koop, G. (2024). Total bacterial count and somatic cell count in bulk and individual goat milk around kidding: two longitudinal observational studies. Journal of Dairy Science, 107(8), 5427-5437. [DOI] [Portal]
Singha, S., Koop, G., Rahman, M. M., Ceciliani, F., Addis, M. F., Howlader, M. M. R., Hossain, M. K., Piccinini, R., Locatelli, C., Persson, Y., & Bronzo, V. (2024). Pathogen group-specific risk factors for intramammary infection in water buffalo. PLoS One, 19(4 ), Article e0299929. [DOI] [Repository]
2023
Scholarly publications
Ni, H., Koop, G., Klugkist, I., & Nielen, M. (2023). Evaluation of Bayesian Hui-Walter and logistic regression latent class models to estimate diagnostic test characteristics with simulated data. Preventive Veterinary Medicine, 217, Article 105972. [DOI] [Repository]
Hostens, M., Lam, T., & Koop, G. (2023). Sustainable Ruminant Health at Utrecht University. American Journal of Veterinary Research, 84(7), 1. [DOI] [Repository]
Exel, C. E., Geus, Y. D., Spaninks, M., Koop, G., & Benedictus, L. (2023). Colonization of Extramammary Sites with Mastitis-Associated S. aureus Strains in Dairy Goats. FEMS Microbiology Immunology, 12(4), 1-8. Article 515. [DOI] [Repository]
Singha, S., Koop, G., Ceciliani, F., Derks, M., Hoque, M. A., Hossain, M. K., Howlader, M. M. R., Rahman, M. M., Khatun, M., Boqvist, S., & Persson, Y. (2023). The prevalence and risk factors of subclinical mastitis in water buffalo (Bubalis bubalis) in Bangladesh. Research in Veterinary Science, 158, 17-25. [DOI] [Repository]
Exel, C. E., Gerritsen, K., Spaninks, M., Duim, B., Koop, G., & Benedictus, L. (2023). Association of Staphylococcus aureus genotypes with milk or colonization of extramammary sites in Dutch dairy cattle indicates strain variation in reservoirs for intramammary infections. Research in Veterinary Science, 154, 138-144. [DOI] [Repository]
2022
Scholarly publications
Bari, M. S., Rahman, M. M., Persson, Y., Derks, M., Sayeed, M. A., Hossain, D., Singha, S., Hoque, M. A., Sivaraman, S., Fernando, P., Ahmad, I., Samad, A., & Koop, G. (2022). Subclinical mastitis in dairy cows in south-Asian countries: a review of risk factors and etiology to prioritize control measures. Veterinary Research Communications, 46(3), 621-640. [DOI] [Repository]
Exel, C. E., Halasa, T., Koop, G., Steeneveld, W., Lam, T. J. G. M., Benedictus, L., & Gussmann, M. (2022). A stochastic modelling approach to determine the effect of diverse Staphylococcus aureus strains on the economic and epidemiological outcomes of mastitis intervention strategies in dairy cattle. Preventive Veterinary Medicine, 199, 1-10. Article 105566. [DOI] [Repository]
2021
Scholarly publications
Singha, S., Koop, G., Persson, Y., Hossain, D., Scanlon, L., Derks, M., Hoque, M. A., & Rahman, M. M. (2021). Incidence, Etiology, and Risk Factors of Clinical Mastitis in Dairy Cows under Semi-Tropical Circumstances in Chattogram, Bangladesh. Animals, 11(8), 1-17. Article 2255. [DOI] [Repository]
Deng, Z., Lam, T. J. G. M., Hogeveen, H., & Koop, G. (2021). Regularly fluctuating somatic cell count pattern in dairy herds. Journal of Dairy Science, 104(10), 11126-11134. [DOI] [Repository]
Deng, Z., Koop, G., Hogeveen, H., Fischer, E. A. J., van den Borne, B. H. P., van der Tol, R., & Lam, T. J. G. M. (2021). Transmission dynamics of Staphylococcus aureus and Streptococcus agalactiae in a Dutch dairy herd using an automatic milking system. Preventive Veterinary Medicine, 192, Article 105384. [DOI] [Repository]
Griffioen, K., Velthuis, A. G. J., Koop, G., & Lam, T. J. G. M. (2021). Effects of a mastitis treatment strategy with or without on-farm testing. Journal of Dairy Science, 104(4), 4665-4681. [DOI] [Repository]
van den Crommenacker-Konings, L. W. J. H., van Dam, P., Everts, R., Shittu, A., Nielen, M., Lam, T. J. G. M., & Koop, G. (2021). Dynamics of intramammary infections in suckler ewes during early lactation. Journal of Dairy Science, 104(5), 5979-5987. [DOI] [Repository]
Palaseweenun, P., Hagen-Plantinga, E. A., Schonewille, J. T., Koop, G., Butre, C., Jonathan, M., Wierenga, P. A., & Hendriks, W. H. (2021). Urinary excretion of advanced glycation end products in dogs and cats. Journal of Animal Physiology and Animal Nutrition, 105(1), 149-156. [DOI] [Repository]
2020
Scholarly publications
Hoekstra, J., Zomer, A. L., Rutten, V. P. M. G., Benedictus, L., Stegeman, A., Spaninks, M. P., Bennedsgaard, T. W., Biggs, A., De Vliegher, S., Mateo, D. H., Huber-Schlenstedt, R., Katholm, J., Kovács, P., Krömker, V., Lequeux, G., Moroni, P., Pinho, L., Smulski, S., Supré, K., ... Koop, G. (2020). Genomic analysis of European bovine Staphylococcus aureus from clinical versus subclinical mastitis. Scientific Reports, 10(1), Article 18172. [DOI] [Repository]
Deng, Z., Hogeveen, H., Lam, T. J. G. M., van der Tol, R., & Koop, G. (2020). Performance of Online Somatic Cell Count Estimation in Automatic Milking Systems. Frontiers in Veterinary Science, 7, Article 221. [DOI] [Repository]
Deng, Z., Lam, T. J. G. M., Hogeveen, H., Spaninks, M., Heij, N., Postema, M., van Werven, T., & Koop, G. (2020). Antimicrobial use and farmers' attitude toward mastitis treatment on dairy farms with automatic or conventional milking systems. Journal of Dairy Science, 103(8). [DOI] [Repository]
Akter, S., Rahman, M. M., Sayeed, M. A., Islam, M. N., Hossain, D., Hoque, M. A., & Koop, G. (2020). Prevalence, aetiology and risk factors of subclinical mastitis in goats in Bangladesh. Small Ruminant Research, 184. [DOI] [Repository]
2019
Scholarly publications
Hoekstra, J., Rutten, V. P. M. G., Lam, T. J. G. M., van Kessel, K., Spaninks, M. P., Stegeman, J. A., Benedictus, L., & Koop, G. (2019). Activation of a Bovine Mammary Epithelial Cell Line by Ruminant-Associated Staphylococcus aureus is Lineage Dependent. Microorganisms, 12(7), Article 688. [DOI] [Repository]
Hoekstra, J., Rutten, V. P. M. G., van den Hout, M., Spaninks, M. P., Benedictus, L., & Koop, G. (2019). Differences between Staphylococcus aureus lineages isolated from ovine and caprine mastitis but not between isolates from clinical or subclinical mastitis. Journal of Dairy Science, 102(6), 5430-5437. [DOI] [Repository]
Deng, Z., Koop, G., Lam, T. J. G. M., van der Lans, I. A., Vernooij, J. C. M., & Hogeveen, H. (2019). Farm-level risk factors for bovine mastitis in Dutch automatic milking dairy herds. Journal of Dairy Science, 102(5), 4522-4535. [DOI] [Repository]
2018
Scholarly publications
Mekonnen, S. A., Lam, T. J. G. M., Hoekstra, J., Rutten, V. P. M. G., Tessema, T. S., Broens, E. M., Riesebos, A. E., Spaninks, M. P., & Koop, G. (2018). Characterization of Staphylococcus aureus isolated from milk samples of dairy cows in small holder farms of North-Western Ethiopia. BMC Veterinary Research, 14(1), Article 246. [DOI] [Repository]
Uiterwijk, M., Nijsse, R., Kooyman, F. N. J., Wagenaar, J. A., Mughini-Gras, L., Koop, G., & Ploeger, H. W. (2018). Comparing four diagnostic tests for Giardia duodenalis in dogs using latent class analysis. Parasites & Vectors, 11(1), Article 439. [DOI] [Repository]
Hoekstra, J., Rutten, V., Sommeling, L., van Werven, T., Spaninks, M., Duim, B., Benedictus, L., & Koop, G. (2018). High Production of LukMF' in Staphylococcus aureus Field Strains Is Associated with Clinical Bovine Mastitis. Toxins, 10(5), Article 200. [DOI] [Repository]
de Jong, N. W. M., Vrieling, M., Garcia, B. L., Koop, G., Brettmann, M., Aerts, P. C., Ruyken, M., van Strijp, J. A. G., Holmes, M. A., Harrison, E. M., Geisbrecht, B. V., & Rooijakkers, S. H. M. (2018). Identification of a staphylococcal complement inhibitor with broad host specificity in equid Staphylococcus aureus strains. Journal of Biological Chemistry, 293(12), 4468 –4477. [DOI] [Repository]
Rainard, P., Foucras, G., Fitzgerald, J. R., Watts, J. L., Koop, G., & Middleton, J. R. (2018). Knowledge gaps and research priorities in Staphylococcus aureus mastitis control. Transboundary and Emerging Diseases, 65(S1), 149-165. [DOI] [Repository]
2017
Scholarly publications
Mekonnen, S. A., Koop, G., Lam, T. J. G. M., & Hogeveen, H. (2017). The intention of North-Western Ethiopian dairy farmers to control mastitis. PLoS One, 12(8), Article e0182727. [DOI] [Repository]
Mekonnen, S. A., Koop, G., Melkie, S. T., Getahun, C. D., Hogeveen, H., & Lam, T. J. G. M. (2017). Prevalence of subclinical mastitis and associated risk factors at cow and herd level in dairy farms in North-West Ethiopia. Preventive Veterinary Medicine, 145, 23-31. [DOI] [Repository]
Koop, G., Vrieling, M., Storisteanu, D. M. L., Lok, L. S. C., Monie, T., van Wigcheren, G., Raisen, C., Ba, X., Gleadall, N., Hadjirin, N., Timmerman, A. J., Wagenaar, J. A., Klunder, H. M., Fitzgerald, J. R., Zadoks, R., Paterson, G. K., Torres, C., Waller, A. S., Loeffler, A., ... Holmes, M. A. (2017). Identification of LukPQ, a novel, equid-adapted leukocidin of Staphylococcus aureus. Scientific Reports, 7, Article 40660. [DOI] [Repository]
2016
Scholarly publications
Koop, G. (2016). MRSA transmission between horses and vets: who's doing the infecting? Veterinary Record, 178(19), 471-2. [DOI] [Repository]
Koop, G., Islam, M. N., Rahman, M. M., Khatun, M., Ferdous, J., Sayeed, M. A., Islam, S., Ahaduzzaman, M., Akter, S., Mannan, A., Hassan, M. M., Dissanayake, R., & Hoque, M. A. (2016). Risk factors and therapy for goat mastitis in a hospital-based case-control study in Bangladesh. Preventive Veterinary Medicine, 124, 52-57. [DOI] [Repository]
2015
Scholarly publications
Koop, G., van Werven, T., Roffel, S., Hogeveen, H., Nazmi, K., & Bikker, F. J. (2015). Protease activity measurement in milk as a diagnostic test for clinical mastitis in dairy cows. Journal of Dairy Science, 98(7), 4613-4618. [DOI] [Repository]
Paterson, G. K., Harrison, E. M., Murray, G. G. R., Welch, J. J., Warland, J. H., Holden, M. T. G., Morgan, F. J. E., Ba, X., Koop, G., Harris, S. R., Maskell, D. J., Peacock, S. J., Herrtage, M. E., Parkhill, J., & Holmes, M. A. (2015). Capturing the cloud of diversity reveals complexity and heterogeneity of MRSA carriage, infection and transmission. Nature Communications [E], 6, 1-10. Article 6560. [DOI] [Portal]
2014
Scholarly publications
Koop, G. (2014). Is Quantification the Key? A Reply to Nederbragt. Social Epistemology Review and Reply Collective. http://social-epistemology.com/2014/07/03/is-quantification-the-key-a-reply-to-nederbragt-gerrit-koop/
Bikker, F. J., Koop, G., Leusink, N. B., Nazmi, K., Kaman, W. E., Brand, H. S., & Veerman, E. C. I. (2014). Tailor made plasmin substrates as potential diagnostic tool to test for mastitis. Veterinary Research Communications, 38(4), 271-277. [DOI]
Monger, V. R., Stegeman, J. A., Koop, G., Dukpa, K., Tenzin, T., & Loeffen, W. L. A. (2014). Seroprevalence and associated risk factors of important pig viral diseases in Bhutan. Preventive Veterinary Medicine, 117(1), 222-232. [DOI]
Hogerwerf, L., Koop, G., Klinkenberg, D., Roest, H. I. J., Vellema, P., & Nielen, M. (2014). Test and cull of high risk Coxiella burnetii infected pregnant dairy goats is not feasible due to poor test performance. Veterinary Journal, 200(2), 343-345. [DOI]
2013
Scholarly publications
Koop, G., Collar, C. A., Toft, N., Nielen, M., van Werven, T., Bacon, D. A. C., & Gardner, I. A. (2013). Risk factors for subclinical intramammary infection in dairy goats in two longitudinal field studies evaluated by Bayesian logistic regression. Preventive Veterinary Medicine, 108(4), 304-312. [DOI]
Professional publications
Koop, G. (2013). Tip van de Expert: kiemgetal. Geitenhouderij.
Koop, G., & Wolters, W. (2013). Oorzaken van hoog kiemgetal. Geitenhouderij, 8-10.
2012
Scholarly publications
Koop, G., Toft, N., Gardner, I. A., van Werven, T., & Nielen, M. (2012). Bayesian logistic regression model of risk factors for subclinical intramammary infection in dairy goats. In Proceedings of the SVEPM annual meeting 2012
Koop, G., Visscher, A., Collar, C. A., Bacon, D. A. C., Maga, E. A., Murray, J. D., Supré, K., de Vliegher, S., Haesebrouck, F., Rowe, J. D., Nielen, M., & van Werven, T. (2012). Short communication: Identification of coagulase-negative staphylococcus species from goat milk with the API Staph identification test and with transfer RNA-intergenic spacer PCR combined with capillary electrophoresis. Journal of Dairy Science, 95, 7200-7205. [DOI]
Koop, G. (2012). Udder health in dairy goats. [Doctoral thesis 1 (Research UU / Graduation UU), Utrecht University]. Utrecht University. [Repository]
Koop, G., de Vliegher, S. P., Visscher, A., Supré, K., Haesebrouck, F., Nielen, M., & van Werven, T. (2012). Differences between coagulase-negative Staphylococcus species in persistence and in effect on somatic cell count and milk yield in dairy goats. Journal of Dairy Science, 95(9), 5075-5084. [DOI]
Koop, G., Nielen, M., & van Werven, T. (2012). Diagnostic tools to monitor udder health in dairy goats. Veterinary Quarterly, 32(1), 37-44. [DOI]
Kluivers-Poodt, M., Houx, B. B., Robben, S. R. M., Koop, G., Lambooij, E., & Hellebrekers, L. J. (2012). Effects of a local anaesthetic and NSAID in castration of piglets, on the acute pain responses, growth and mortality. Animal, 6(9), 1469-1475. [DOI] [Repository]
Professional publications
Koop, G. (2012). Gezonde uiers Ingewikkeld, maar van belang. Geitenhouderij, 16(3), 8-10. [Repository]
2011
Scholarly publications
Koop, G., van Werven, T., Toft, N., & Nielen, M. (2011). Estimating test characteristics of somatic cell count to detect Staphylococcus aureus-infected dairy goats using latent class analysis. Journal of Dairy Science, 94, 2902-2911. [DOI]
2010
Scholarly publications
Koop, G., Dik, N., Nielen, M., & Lipman, L. J. A. (2010). Repeatability of differential goat bulk milk culture and associations with somatic cell count, total bacterial count, and standard plate count. Journal of Dairy Science, 93, 2569-2573. [DOI] [Repository]
Koop, G., van Werven, T., Schuiling, H. J., & Nielen, M. (2010). The effect of subclinical mastitis on milk yield in dairy goats. Journal of Dairy Science, 93(12), 5809-5817. [DOI]
Koop, G., Rietman, J. F., & Pieterse, M. C. (2010). Staphylococcus aureus mastitis in Texel sheep associated with suckling twins. Veterinary Record, 167(22), 868-869. [DOI] [Repository]
2009
Scholarly publications
Koop, G., Nielen, M., & van Werven, T. (2009). Bulk milk somatic cell counts are related to bulk milk total bacterial counts and several herd-level risk factors in dairy goats. Journal of Dairy Science, 92, 4355-4364.
2008
Professional publications
Koop, G., & van Eerdenburg, F. J. (2008). Natuurlijk moedergedrag bij de zeug en de expressie hiervan in de moderne zeugenhouderij: een literatuuroverzicht. Tijdschrift voor Diergeneeskunde, 133(4), 140-143. [Repository]
2006
Scholarly publications
Wijnker, J. J., Koop, G., & Lipman, L. J. A. (2006). Antimicrobial properties of salt (NaCl) used for the preservation of natural casings. Food Microbiology, 23(7), 657-662.
2005
Professional publications
Koop, G., Wijnker, J. J., & Lipman, L. J. A. (2005). Microbiologische veiligheid van natuurdarmen. Voedingsmiddelentechnologie, 23, 14-15.