World's Best Scientists 2026 revealed!

D-Index & Metrics

Animal Science and Veterinary

D-Index
27
Citations
2270
World Ranking
2843
National Ranking
165

Overview

What is he best known for?

The fields of study he is best known for:

  • Internal medicine
  • Disease
  • Virus

John R. Campbell mostly deals with Veterinary medicine, Feces, Animal science, Herd and Cryptococcus gattii. His Veterinary medicine research incorporates elements of Odds ratio, Case-control study and Matched control. John R. Campbell focuses mostly in the field of Feces, narrowing it down to matters related to Pasture and, in some cases, Ostertagia ostertagi, Bulk tank and Animal husbandry.

His Animal science research is multidisciplinary, relying on both Tetracycline, Drug resistance and Anthelmintic. The study incorporates disciplines such as Predictive value of tests, Gynecology, False Negative Reactions and Confidence interval in addition to Herd. His Cryptococcus gattii research incorporates elements of Mammal, Opportunistic Sampling and Wildlife.

His most cited work include:

  • Cryptococcus gattii in wildlife of Vancouver Island, British Columbia, Canada. (59 citations)
  • Evaluation of client compliance with short-term administration of antimicrobials to dogs. (54 citations)
  • A longitudinal study of gastrointestinal parasites in Canadian dairy farms. The value of an indirect Ostertagia ostertagi ELISA as a monitoring tool. (52 citations)

What are the main themes of his work throughout his whole career to date?

Veterinary medicine, Animal science, Herd, Beef cattle and Ice calving are his primary areas of study. His research in Veterinary medicine intersects with topics in Feedlot, Antimicrobial, Ostertagia ostertagi, Disease and Antibiotic resistance. His Feedlot research includes themes of Livestock and Internal medicine.

John R. Campbell has researched Animal science in several fields, including Feces, Pasture, Cattle Diseases, Grazing and Anthelmintic. In general Herd study, his work on Cow-calf often relates to the realm of Tritrichomonas foetus, thereby connecting several areas of interest. His work deals with themes such as Body weight and Claw, which intersect with Beef cattle.

He most often published in these fields:

  • Veterinary medicine (33.64%)
  • Animal science (30.00%)
  • Herd (26.36%)

What were the highlights of his more recent work (between 2017-2021)?

  • Herd (26.36%)
  • Animal science (30.00%)
  • Ice calving (12.73%)

In recent papers he was focusing on the following fields of study:

His primary areas of study are Herd, Animal science, Ice calving, Beef cattle and Weaning. His Herd study is concerned with Veterinary medicine in general. His Veterinary medicine research is multidisciplinary, incorporating perspectives in Livestock, Feedlot cattle, Antibiotic resistance and Diarrhea.

His study on Sire is often connected to Repeatability as part of broader study in Animal science. His study focuses on the intersection of Beef cattle and fields such as Anthelmintic with connections in the field of Species diversity, Feedlot, Epidemiology, Feces and Nematodirus. His research on Disease also deals with topics like

  • Foot rot, which have a strong connection to Virus,
  • Viral diarrhea that intertwine with fields like Vaccination and Antibody.

Between 2017 and 2021, his most popular works were:

  • Effect of ruminal acidosis and short-term low feed intake on indicators of gastrointestinal barrier function in Holstein steers (15 citations)
  • Quantifying subclinical trauma associated with calving difficulty, vigour, and passive immunity in newborn beef calves. (6 citations)
  • Antimicrobial resistance in fecal Escherichia coli and Campylobacter spp. from beef cows in western Canada and associations with herd attributes and antimicrobial use. (5 citations)

In his most recent research, the most cited papers focused on:

  • Internal medicine
  • Disease
  • Pathology

His scientific interests lie mostly in Ice calving, Herd, Passive immunity, Physiology and Veterinary medicine. His work carried out in the field of Herd brings together such families of science as Florfenicol and Livestock. John R. Campbell usually deals with Passive immunity and limits it to topics linked to Placebo and Randomized controlled trial.

His study in Physiology is interdisciplinary in nature, drawing from both Blood sampling and Subclinical infection. In his articles, he combines various disciplines, including Veterinary medicine and Reason for Treatment. His research integrates issues of Incidence, Bovine respiratory disease and Cow-calf in his study of Beef cattle.

Best Publications

  • Evaluation of client compliance with short-term administration of antimicrobials to dogs.

    Vicki J Adams;John R Campbell;Cheryl L Waldner;Patricia M Dowling

  • Effect of bovine viral diarrhea virus in the feedlot

    John R. Campbell

  • Cryptococcus gattii in wildlife of Vancouver Island, British Columbia, Canada.

    Colleen Duncan;H. Schwantje;C. Stephen;J. Campbell

  • Clinical characteristics and predictors of mortality for Cryptococcus gattii infection in dogs and cats of southwestern British Columbia.

    Colleen Duncan;Craig Stephen;John Campbell

  • A longitudinal study of gastrointestinal parasites in Canadian dairy farms. The value of an indirect Ostertagia ostertagi ELISA as a monitoring tool.

    Javier Sanchez;Ian Dohoo;Ane Nødtvedt;Greg Keefe

  • Efficacy of vaccination against Fusobacterium necrophorum infection for control of liver abscesses and footrot in feedlot cattle in western Canada.

    Sylvia L. Checkley;Eugene D. Janzen;John R. Campbell;John J. McKinnon

  • Comparison of two sampling tools for diagnosis of Tritrichomonas foetus in bulls and clinical interpretation of culture results.

    S Parker;J Campbell;C Ribble;A Gajadhar

  • The use of negative binomial modelling in a longitudinal study of gastrointestinal parasite burdens in Canadian dairy cows

    Ane Nødtvedt;Ian Dohoo;Javier Sanchez;Gary Conboy

  • Immunohistochemical study of Hemophilus somnus, Mycoplasma bovis, Mannheimia hemolytica, and bovine viral diarrhea virus in death losses due to myocarditis in feedlot cattle.

    Deborah M. Haines;Karen M. Moline;Ron A. Sargent;John R. Campbell

  • Effect of winter feeding system on beef cow performance, reproductive efficiency, and system cost1

    B.M. Kelln;H.A. Lardner;J.J. McKinnon;J.R. Campbell

  • Associations between antimicrobial use and the prevalence of antimicrobial resistance in fecal Escherichia coli from feedlot cattle in western Canada.

    Sylvia L. Checkley;John R. Campbell;Manuel Chirino-Trejo;Eugene D. Janzen

  • Effects of temperature on the survival of Tritrichomonas foetus in transport, Diamond's and InPouch TF media.

    L. A. Bryan;J. R. Campbell;A. A. Gajadhar

  • Effect of ruminal acidosis and short-term low feed intake on indicators of gastrointestinal barrier function in Holstein steers

    Rae-Leigh A Pederzolli;Andrew G Van Kessel;John Campbell;Steve Hendrick

  • A novel Ehrlichia genotype detected in naturally infected cattle in North America.

    Alvin A. Gajadhar;Vladislav Lobanov;W. Brad Scandrett;John Campbell

  • Evaluation of risk factors for Cryptococcus gattii infection in dogs and cats.

    Colleen G Duncan;Craig Stephen;John Campbell

  • Hair Cortisol Concentration as a Stress Biomarker in Horses: Associations With Body Location and Surgical Castration

    Maria C. Duran;David M. Janz;Cheryl L. Waldner;John R. Campbell

  • Management practices associated with pain in cattle on western Canadian cow–calf operations: A mixed methods study

    M. A. Moggy;E. A. Pajor;W. E. Thurston;S. Parker

  • Comparison of the diagnostic sensitivity of a commercially available culture kit and a diagnostic culture test using Diamond's media for diagnosing Tritrichomonas foetus in bulls.

    Sarah Parker;John Campbell;Alvin Gajadhar

  • Fibrotic lesions in the testis of bulls and relationship to semen quality.

    Albert D. Barth;Leonel Alisio;Mariano Avilés;Andres A. Arteaga

  • Prevalence of methicillin-resistant Staphylococcus aureus colonization in horses in Saskatchewan, Alberta, and British Columbia.

    Nathalie Tokateloff;Stephen T Manning;J Scott Weese;John Campbell

  • Antimicrobial usage in western Canadian cow-calf herds.

    Cheryl L Waldner;Sarah Parker;Sheryl Gow;Devon J Wilson

  • Diagnosis of trichomoniasis in 'virgin' bulls by culture and polymerase chain reaction.

    Sarah Parker;John Campbell;Kathy McIntosh;Alvin Gajadhar

  • Use of serologic evaluation for antibodies against bovine viral diarrhea virus for detection of persistently infected calves in beef herds.

    Cheryl L. Waldner;John R. Campbell

  • Associations between oil- and gas-well sites, processing facilities, flaring, and beef cattle reproduction and calf mortality in western Canada.

    C.L Waldner;C.S Ribble;E.D Janzen;J.R Campbell

  • Survey of Mycobacterium avium subspecies paratuberculosis serological status in beef herds on community pastures in Saskatchewan

    Cheryl L. Waldner;Gail L. Cunningham;Eugene D. Janzen;John R. Campbell

  • A novel Ehrlichia genotype detected in naturally infected cattle in

    Alvin A. Gajadhar;Vladislav Lobanov;W. Brad Scandrett;John Campbell

Frequent Co-Authors

Cheryl L. Waldner
Cheryl L. Waldner University of Saskatchewan
John J. McKinnon
John J. McKinnon University of Saskatchewan
Edmond A. Pajor
Edmond A. Pajor University of Calgary
Ken E. Leslie
Ken E. Leslie University of Guelph
Ian R. Dohoo
Ian R. Dohoo University of Prince Edward Island
Janet E. Hill
Janet E. Hill University of Saskatchewan
Michael E. R. Dugan
Michael E. R. Dugan Agriculture and Agriculture-Food Canada
Greg P. Keefe
Greg P. Keefe University of Prince Edward Island
Sandra M Godden
Sandra M Godden University of Minnesota
John S. Gilleard
John S. Gilleard University of Calgary

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