World's Best Scientists 2026 revealed!
John S. Gilleard

John S. Gilleard

D-Index & Metrics

Animal Science and Veterinary

D-Index
56
Citations
9543
World Ranking
433
National Ranking
32

John S. Gilleard 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 S. Gilleard 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: 200 publications — 74th percentile

74% of scientists in this discipline score the same or lower.

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

John S. Gilleard 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 S. Gilleard 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: 56 D-Index — 87th percentile

87% of scientists in this discipline score the same or lower.

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

Overview

John S. Gilleard is a researcher affiliated with the University of Calgary in Canada, specializing in fields related to veterinary science, environmental science, and immunology and microbiology. Their work spans multiple subfields including small animals, ecology, parasitology, plant science, and insect science.

The scientist's research topics concentrate primarily on helminth infection and control, parasite biology and host interactions, and nematode management and characterization studies. Additional areas of study include parasitic infections and diagnostics, environmental DNA in biodiversity studies, and coccidia and coccidiosis research.

Frequent coauthors in their research collaborations include Elizabeth Redman, Russell W. Avramenko, Ray M. Kaplan, Rebecca Chen, and Janneke Wit.

John S. Gilleard has published extensively in several scientific venues. Key journals where they have contributed notably include:

  • bioRxiv (Cold Spring Harbor Laboratory) with 12 publications
  • Veterinary Parasitology with 9 publications
  • International Journal for Parasitology Drugs and Drug Resistance with 8 publications
  • International Journal for Parasitology with 7 publications
  • Parasites & Vectors with 4 publications

Recent publications provide examples of their research output and focus areas. These include:

  • "World Association for the Advancement of Veterinary Parasitology (W.A.A.V.P.) guideline for diagnosing anthelmintic resistance using the faecal egg count reduction test in ruminants, horses and swine" (2023, Veterinary Parasitology)
  • "Genomic and transcriptomic variation defines the chromosome-scale assembly of Haemonchus contortus, a model gastrointestinal worm" (2020, Communications Biology)
  • "A database for ITS2 sequences from nematodes" (2020, BMC Genetics)
  • "A repeatable and quantitative DNA metabarcoding assay to characterize mixed strongyle infections in horses" (2020, International Journal for Parasitology)
  • "Challenges and opportunities for the adoption of molecular diagnostics for anthelmintic resistance" (2020, International Journal for Parasitology Drugs and Drug Resistance)

Best Publications

  • Acaricide resistance in cattle ticks and approaches to its management: The state of play

    Rao Z. Abbas;Muhammad Arfan Zaman;Muhammad Arfan Zaman;Douglas D. Colwell;John Gilleard

  • The genome and transcriptome of Haemonchus contortus, a key model parasite for drug and vaccine discovery

    Roz Laing;Taisei Kikuchi;Taisei Kikuchi;Axel Martinelli;Isheng J. Tsai;Isheng J. Tsai

  • Exploring the Gastrointestinal "Nemabiome": Deep Amplicon Sequencing to Quantify the Species Composition of Parasitic Nematode Communities.

    Russell W. Avramenko;Elizabeth M. Redman;Roy Lewis;Thomas A. Yazwinski

  • Caenorhabditis elegans is a useful model for anthelmintic discovery.

    Andrew R. Burns;Genna M. Luciani;Gabriel Musso;Gabriel Musso;Rachel Bagg

  • Understanding anthelmintic resistance: The need for genomics and genetics

    John Stuart Gilleard

  • cis regulatory requirements for hypodermal cell-specific expression of the Caenorhabditis elegans cuticle collagen gene dpy-7.

    J S Gilleard;J D Barry;I L Johnstone

  • Recent advances in candidate-gene and whole-genome approaches to the discovery of anthelmintic resistance markers and the description of drug/receptor interactions

    Andrew C. Kotze;Peter W. Hunt;Philip John Skuce;Georg von Samson-Himmelstjerna

  • World Association for the Advancement of Veterinary Parasitology (W.A.A.V.P.) guideline for diagnosing anthelmintic resistance using the faecal egg count reduction test in ruminants, horses and swine.

    Unknown

  • Botanicals: an alternative approach for the control of avian coccidiosis

    R.Z. Abbas;D.D. Colwell;J. Gilleard

  • RNA interference in parasitic helminths: current situation, potential pitfalls and future prospects.

    Peter Geldhof;Aline Visser;D Clark;G Saunders

  • Haemonchus contortus as a paradigm and model to study anthelmintic drug resistance.

    John S. Gilleard

  • Multiple drug resistance in the canine hookworm Ancylostoma caninum : an emerging threat?

    Pablo D. Jimenez Castro;Pablo D. Jimenez Castro;Sue B. Howell;John J. Schaefer;Russell W. Avramenko

  • The emergence of resistance to the benzimidazole anthlemintics in parasitic nematodes of livestock is characterised by multiple independent hard and soft selective sweeps.

    Elizabeth Redman;Fiona Whitelaw;Andrew Tait;Charlotte Burgess

  • Testing the efficacy of RNA interference in Haemonchus contortus.

    Peter Geldhof;Linda Murray;Annabelle Couthier;John S. Gilleard

  • The use of nemabiome metabarcoding to explore gastro-intestinal nematode species diversity and anthelmintic treatment effectiveness in beef calves

    Russell W. Avramenko;Elizabeth M. Redman;Roy Lewis;Murilo A. Bichuette

  • Population genetics of anthelmintic resistance in parasitic nematodes.

    J. S. Gilleard;R. N. Beech

  • Genomic and transcriptomic variation defines the chromosome-scale assembly of Haemonchus contortus, a model gastrointestinal worm.

    Stephen R. Doyle;Alan Tracey;Roz Laing;Nancy E. Holroyd

  • Anthelmintic resistance: markers for resistance, or susceptibility?

    R. N. Beech;P. Skuce;D. J. Bartley;R. J. Martin

  • Parasite prevalence in fecal samples from shelter dogs and cats across the Canadian provinces.

    Alain Villeneuve;Lydden Polley;Emily Jenkins;Janna Schurer

  • Deep amplicon sequencing as a powerful new tool to screen for sequence polymorphisms associated with anthelmintic resistance in parasitic nematode populations.

    Russell W. Avramenko;Elizabeth M. Redman;Lynsey Melville;Yvonne Bartley

  • A survey of the trichostrongylid nematode species present on UK sheep farms and associated anthelmintic control practices

    Charlotte G S Burgess;Yvonne Bartley;Elizabeth Redman;Philip J Skuce

  • Genetic Diversity and Population Structure of Haemonchus contortus.

    J S Gilleard;E Redman

  • Introgression of ivermectin resistance genes into a susceptible Haemonchus contortus strain by multiple backcrossing

    Elizabeth Redman;Neil Sargison;Fiona Whitelaw;Frank Jackson

Frequent Co-Authors

Elizabeth Redman
Elizabeth Redman University of Calgary
Neil Sargison
Neil Sargison University of Edinburgh
David J. Bartley
David J. Bartley Moredun Research Institute
Matthew Berriman
Matthew Berriman University of Glasgow
Alison A. Morrison
Alison A. Morrison Moredun Research Institute
James Cotton
James Cotton University of Glasgow
Eileen Devaney
Eileen Devaney University of Glasgow
Ray M. Kaplan
Ray M. Kaplan St. George's University
Philip Skuce
Philip Skuce Moredun Foundation
Bruno Levecke
Bruno Levecke Ghent University

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Related Online Degrees & Career Pathways

For students interested in Animal Science and Veterinary studies, exploring related fields through online degrees can broaden career opportunities. Programs such as apa accredited psyd programs online provide advanced training in psychology, which is valuable for those looking to understand animal behavior or pursue interdisciplinary careers combining animal and human sciences.

Similarly, an addiction counseling online degree can offer insights into veterinary toxicology or animal welfare issues linked to substance abuse. Understanding counseling techniques may aid professionals working with animal owners facing addiction challenges.

Degrees like the marriage and family counseling degree online also emphasize communication and relationship management, skills transferable to client interactions in veterinary practice or animal care settings.

For those aiming at research or academic roles, pursuing an online phd in counseling can deepen expertise in behavioral sciences, which enhances capabilities in animal behavior research or veterinary education.

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