World's Best Scientists 2026 revealed!

D-Index & Metrics

Animal Science and Veterinary

D-Index
31
Citations
4125
World Ranking
2256
National Ranking
134

John A. VanLeeuwen publication distribution in Animal Science and Veterinary in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Animal Science and Veterinary in 2026. The highlighted bar marks where John A. VanLeeuwen sits on this spectrum.

29–33 publications: 1 scientists 34–38 publications: 6 scientists 39–43 publications: 17 scientists 44–48 publications: 23 scientists 49–53 publications: 28 scientists 54–58 publications: 44 scientists 59–63 publications: 66 scientists 64–68 publications: 75 scientists 69–73 publications: 71 scientists 74–78 publications: 85 scientists 79–83 publications: 108 scientists 84–88 publications: 105 scientists 89–93 publications: 84 scientists 94–98 publications: 103 scientists 99–103 publications: 97 scientists 104–108 publications: 95 scientists 109–113 publications: 89 scientists 114–118 publications: 88 scientists 119–123 publications: 109 scientists 124–128 publications: 93 scientists 129–133 publications: 89 scientists 134–138 publications: 95 scientists 139–143 publications: 92 scientists 144–148 publications: 80 scientists 149–153 publications: 75 scientists 154–158 publications: 74 scientists 159–163 publications: 67 scientists 164–168 publications: 53 scientists 169–173 publications: 62 scientists 174–178 publications: 63 scientists 179–183 publications: 50 scientists 184–188 publications: 55 scientists 189–193 publications: 50 scientists 194–198 publications: 27 scientists 199–203 publications: 44 scientists 204–208 publications: 31 scientists 209–213 publications: 28 scientists 214–218 publications: 38 scientists 219–223 publications: 33 scientists 224–228 publications: 36 scientists 229–233 publications: 29 scientists 234–238 publications: 35 scientists 239–243 publications: 23 scientists 244–248 publications: 24 scientists 249–253 publications: 29 scientists 254–258 publications: 28 scientists 259–263 publications: 21 scientists 264–268 publications: 25 scientists 269–273 publications: 11 scientists 274–278 publications: 18 scientists 279–283 publications: 13 scientists 284–288 publications: 18 scientists 289–293 publications: 10 scientists 294–298 publications: 12 scientists 299–303 publications: 11 scientists 304–308 publications: 15 scientists 309–313 publications: 14 scientists 314–318 publications: 14 scientists 319–323 publications: 8 scientists 324–328 publications: 8 scientists 329–333 publications: 13 scientists 334–338 publications: 14 scientists 339–343 publications: 13 scientists 344–348 publications: 10 scientists 349–353 publications: 11 scientists 354–358 publications: 5 scientists 359–363 publications: 8 scientists 364–368 publications: 8 scientists 369–373 publications: 6 scientists 374–378 publications: 7 scientists 379–383 publications: 8 scientists 384–388 publications: 3 scientists 389–393 publications: 4 scientists 394–398 publications: 5 scientists 399–403 publications: 8 scientists 404–408 publications: 5 scientists 409–413 publications: 4 scientists 414–418 publications: 3 scientists 419–423 publications: 8 scientists 424–428 publications: 5 scientists 429–433 publications: 3 scientists 434–438 publications: 5 scientists 439–441 publications: 5 scientists 442+ publications: 99 scientists
29 publications 442+

This scientist: 134 publications — 48th percentile

48% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 442 publications or more.

John A. VanLeeuwen D-index placement in Animal Science and Veterinary in 2026

The chart shows the D-index (discipline H-index) distribution of Animal Science and Veterinary scientists ranked by Research.com in 2026. The highlighted bar marks where John A. VanLeeuwen sits on this spectrum.

20 D-Index: 5 scientists 21 D-Index: 22 scientists 22 D-Index: 31 scientists 23 D-Index: 44 scientists 24 D-Index: 53 scientists 25 D-Index: 66 scientists 26 D-Index: 80 scientists 27 D-Index: 101 scientists 28 D-Index: 106 scientists 29 D-Index: 116 scientists 30 D-Index: 154 scientists 31 D-Index: 158 scientists 32 D-Index: 143 scientists 33 D-Index: 137 scientists 34 D-Index: 126 scientists 35 D-Index: 134 scientists 36 D-Index: 112 scientists 37 D-Index: 115 scientists 38 D-Index: 105 scientists 39 D-Index: 111 scientists 40 D-Index: 107 scientists 41 D-Index: 87 scientists 42 D-Index: 74 scientists 43 D-Index: 62 scientists 44 D-Index: 61 scientists 45 D-Index: 41 scientists 46 D-Index: 51 scientists 47 D-Index: 43 scientists 48 D-Index: 28 scientists 49 D-Index: 47 scientists 50 D-Index: 40 scientists 51 D-Index: 34 scientists 52 D-Index: 33 scientists 53 D-Index: 43 scientists 54 D-Index: 16 scientists 55 D-Index: 32 scientists 56 D-Index: 21 scientists 57 D-Index: 18 scientists 58 D-Index: 28 scientists 59 D-Index: 33 scientists 60 D-Index: 17 scientists 61 D-Index: 21 scientists 62 D-Index: 18 scientists 63 D-Index: 21 scientists 64 D-Index: 9 scientists 65 D-Index: 20 scientists 66 D-Index: 11 scientists 67 D-Index: 16 scientists 68 D-Index: 12 scientists 69 D-Index: 17 scientists 70 D-Index: 13 scientists 71 D-Index: 15 scientists 72 D-Index: 11 scientists 73 D-Index: 11 scientists 74 D-Index: 14 scientists 75 D-Index: 5 scientists 76 D-Index: 6 scientists 77+ D-Index: 100 scientists
20 D-Index 77+

This scientist: 31 D-Index — 30th percentile

30% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 77 D-Index or more.

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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