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Animal Science and Veterinary

D-Index
31
Citations
4125
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2253
National Ranking
134

Overview

John A. VanLeeuwen is affiliated with the University of Prince Edward Island in Canada. Their work centers on Agricultural and Biological Sciences with a focus on several subfields including Agronomy and Crop Science, Small Animals, Genetics, Animal Science and Zoology, and Management, Monitoring, Policy and Law.

Their research covers diverse topics central to livestock and animal studies, such as:

  • Genetic and phenotypic traits in livestock
  • Animal Behavior and Welfare Studies
  • Ruminant Nutrition and Digestive Physiology
  • Animal Disease Management and Epidemiology
  • Reproductive Physiology in Livestock
  • Animal health and immunology
  • Effects of Environmental Stressors on Livestock

VanLeeuwen has contributed to multiple recent papers published in internationally recognized journals. Selected examples include:

  • Incidence and effects of subacute ruminal acidosis and subclinical ketosis with respect to postpartum anestrus in grazing dairy cows, 2020, Heliyon
  • Effects of Calliandra and Sesbania on Daily Milk Production in Dairy Cows on Commercial Smallholder Farms in Kenya, 2020, Veterinary Medicine International
  • Management factors associated with time-to-onset and fecal egg/oocyst counts of gastrointestinal parasites in heifer calves on Kenyan smallholder farms, 2020, Veterinary Parasitology
  • Evaluation of influence of milk urea nitrogen on reproductive performance in smallholder dairy farms, 2020, Australian Veterinary Journal
  • Communication skills training and assessment of food animal production medicine veterinarians: A component of a voluntary Johne's disease control program, 2022, Journal of Dairy Science

The frequent venues for publishing their work include the East African Journal of Science Technology and Innovation, Preventive Veterinary Medicine, Research in Veterinary Science, SSRN Electronic Journal, and Heliyon.

Collaboratively, VanLeeuwen has worked with a number of recurring co-authors, contributing to a network of research in veterinary and agricultural sciences. Frequent co-authors are:

  • G.K. Gitau
  • Shawn McKenna
  • Luke C. Heider
  • Peter Kimeli
  • Spencer J. Greenwood

Best Publications

  • Johne's disease in Canada Part I: clinical symptoms, pathophysiology, diagnosis, and prevalence in dairy herds.

    Ashwani Tiwari;John A. VanLeeuwen;Shawn L.B. McKenna;Greg P. Keefe

  • Direct production losses and treatment costs from bovine viral diarrhoea virus, bovine leukosis virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum.

    Junwook Chi;John A. VanLeeuwen;Alfons Weersink;Gregory P. Keefe

  • Johne's disease in Canada part II: disease impacts, risk factors, and control programs for dairy producers.

    Shawn L.B. McKenna;Greg P. Keefe;Ashwani Tiwari;John VanLeeuwen

  • The effect of non-nutritional factors on milk urea nitrogen levels in dairy cows in Prince Edward Island, Canada.

    P. Arunvipas;Ian R. Dohoo;John A. VanLeeuwen;Gregory P. Keefe

  • Seroprevalence of infection with Mycobacterium avium subspecies paratuberculosis, bovine leukemia virus, and bovine viral diarrhea virus in maritime Canada dairy cattle.

    John A. VanLeeuwen;Gregory P. Keefe;R. Tremblay;C. Power

  • A systematic review and meta-analysis of factors associated with anthelmintic resistance in sheep.

    Laura Cristina Falzon;T J O'Neill;P I Menzies;A S Peregrine

  • Lifetime effects of infection with bovine leukemia virus on longevity and milk production of dairy cows.

    Omid Nekouei;John VanLeeuwen;Henrik Stryhn;David Kelton

  • Production effects of pathogens causing bovine leukosis, bovine viral diarrhea, paratuberculosis, and neosporosis

    A. Tiwari;John A. VanLeeuwen;Ian R. Dohoo;Gregory P. Keefe

  • Anthelmintic resistance in sheep flocks in Ontario, Canada

    L.C. Falzon;P.I. Menzies;K.P. Shakya;A. Jones-Bitton

  • Effects of seropositivity for bovine leukemia virus, bovine viral diarrhoea virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum on culling in dairy cattle in four Canadian provinces.

    Ashwani Tiwari;John A. VanLeeuwen;Ian R. Dohoo;Henrik Stryhn

  • Seroprevalences of antibodies against bovine leukemia virus, bovine viral diarrhea virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum in beef and dairy cattle in Manitoba.

    John A. VanLeeuwen;Ashwani Tiwari;Jan C. Plaizier;Terry L. Whiting

  • Risk factors associated with Mycobacterium avium subspecies paratuberculosis seropositivity in Canadian dairy cows and herds.

    A. Tiwari;J. A. VanLeeuwen;I. R. Dohoo;G. P. Keefe

  • Seroprevalence of Mycobacterium avium subspecies paratuberculosis, Neospora caninum, Bovine leukemia virus, and Bovine viral diarrhea virus infection among dairy cattle and herds in Alberta and agroecological risk factors associated with seropositivity

    H. M. Scott;O. Sorensen;J. T. Wu;E. Y. Chow

  • Cow-Level Prevalence of Paratuberculosis in Culled Dairy Cows in Atlantic Canada and Maine

    S.L.B. McKenna;G.P. Keefe;H.W. Barkema;J. McClure

  • The economics of controlling infectious diseases on dairy farms

    Junwook Chi;Alfons Weersink;John A. VanLeeuwen;Gregory P. Keefe

  • Prevalence and distribution of gastrointestinal nematodes on 32 organic and conventional commercial sheep farms in Ontario and Quebec, Canada (2006-2008).

    A. Mederos;S. Fernández;J. VanLeeuwen;A.S. Peregrine

  • Herd-level risk factors for infection with bovine leukemia virus in Canadian dairy herds

    Omid Nekouei;John VanLeeuwen;Javier Sanchez;David Kelton

  • Comparison of serological methods for the diagnosis of Neospora caninum infection in cattle

    W. Wapenaar;H.W. Barkema;J.A. VanLeeuwen;J.T. McClure

  • Risk factors associated with Neospora caninum seropositivity in randomly sampled Canadian dairy cows and herds.

    J. A. VanLeeuwen;J. P. Haddad;I. R. Dohoo;G. P. Keefe

  • Estimate of the direct production losses in Canadian dairy herds with subclinical Mycobacterium avium subspecies paratuberculosis infection.

    Ashwani Tiwari;John A VanLeeuwen;Ian R Dohoo;Greg P Keefe

  • Management factors related to seroprevalences to bovine viral-diarrhoea virus, bovine-leukosis virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum in dairy herds in the Canadian Maritimes.

    Junwook Chi;John A. VanLeeuwen;Alfons Weersink;Gregory P. Keefe

  • Prevalence estimates for paratuberculosis adjusted for test variability using Bayesian analysis.

    G. van Schaik;Y. H. Schukken;C. Crainiceanu;J. Muskens

Frequent Co-Authors

Ian R. Dohoo
Ian R. Dohoo University of Prince Edward Island
Greg P. Keefe
Greg P. Keefe University of Prince Edward Island
Andrew S. Peregrine
Andrew S. Peregrine University of Guelph
Herman W. Barkema
Herman W. Barkema University of Calgary
Henrik Stryhn
Henrik Stryhn University of Prince Edward Island
Alfons Weersink
Alfons Weersink University of Guelph
David F. Kelton
David F. Kelton University of Guelph
Kerry D. Lissemore
Kerry D. Lissemore University of Guelph
Ryan M. O'Handley
Ryan M. O'Handley University of Adelaide
Ynte H. Schukken
Ynte H. Schukken Wageningen University & Research

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