World's Best Scientists 2026 revealed!
Robert M. Friendship

Robert M. Friendship

D-Index & Metrics

Animal Science and Veterinary

D-Index
47
Citations
8596
World Ranking
725
National Ranking
54

Robert M. Friendship 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 Robert M. Friendship 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: 273 publications — 87th percentile

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

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

Robert M. Friendship 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 Robert M. Friendship 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: 47 D-Index — 77th percentile

77% of scientists in this discipline score the same or lower.

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

Overview

Robert M. Friendship is affiliated with the University of Guelph in Canada. Their research spans several fields, primarily within Agricultural and Biological Sciences and Medicine.

The scientist's work focuses on subfields including Agronomy and Crop Science, Animal Science and Zoology, Small Animals, Infectious Diseases, and Genetics. Their research topics concentrate on areas such as Animal Behavior and Welfare Studies, Animal Disease Management and Epidemiology, Viral Gastroenteritis Research and Epidemiology, Animal Virus Infections Studies, Animal Nutrition and Physiology, Microbial Infections and Disease Research, and Influenza Virus Research Studies.

The recent papers authored or coauthored by Friendship demonstrate a focus on swine health and behavior as well as infectious disease research in animals. These include:

  • "Tail-Biting in Pigs: A Scoping Review" (2021), published in Animals
  • "A Case-Control Study to Investigate the Serotypes of S. suis Isolates by Multiplex PCR in Nursery Pigs in Ontario, Canada" (2020), published in Pathogens
  • "Comparative efficacy of a novel Bacillus subtilis-based probiotic and pharmacological zinc oxide on growth performance and gut responses in nursery pigs" (2023), published in Scientific Reports
  • "Veterinarian barriers to knowledge translation (KT) within the context of swine infectious disease research: an international survey of swine veterinarians" (2020), published in BMC Veterinary Research
  • "Effect of Varying Levels of Dietary Tryptophan on Aggression and Abnormal Behavior in Growing Pigs" (2022), published in Frontiers in Veterinary Science

Frequent coauthors who have collaborated with Friendship include:

  • Zvonimir Poljak
  • Terri L. O'Sullivan
  • Abdolvahab Farzan
  • Sheila Keay
  • Annette M. O'Connor

Publication venues where Friendship regularly contributes include:

  • Animals
  • BMC Veterinary Research
  • Journal of Animal Science
  • Frontiers in Veterinary Science
  • Research Square

Best Publications

  • Methicillin resistant Staphylococcus aureus colonization in pigs and pig farmers.

    T. Khanna;R. Friendship;C. Dewey;J.S. Weese

  • Antimicrobial Resistance and Virulence Genes of Escherichia coli Isolates from Swine in Ontario

    Patrick Boerlin;Rebeccah Travis;Carlton L Gyles;Richard Reid-Smith;Richard Reid-Smith

  • Human noroviruses in swine and cattle.

    Kirsten Mattison;Anu Shukla;Angela Cook;Frank Pollari

  • Prevalence of antibodies to the hepatitis E virus in pigs from countries where hepatitis E is common or is rare in the human population.

    Xiang Jin Meng;Serge Dea;Ronald E. Engle;Robert Friendship

  • Longitudinal study of the early-life fecal and nasal microbiotas of the domestic pig

    Mackenzie Jonathan Slifierz;Robert M. Friendship;J. Scott Weese

  • Hematology and biochemistry reference values for Ontario swine.

    R M Friendship;J H Lumsden;I McMillan;M R Wilson

  • Isolation and characterization of nine bacteriophages that lyse O149 enterotoxigenic Escherichia coli

    Nidham Jamalludeen;Roger P. Johnson;Robert Friendship;Andrew M. Kropinski;Andrew M. Kropinski

  • Presentation of postweaning Escherichia coli diarrhea in southern Ontario, prevalence of hemolytic E. coli serogroups involved, and their antimicrobial resistance patterns.

    Rocio Amezcua;Robert M. Friendship;Catherine E. Dewey;Carlton Gyles

  • Alternatives to antibiotic use: probiotics for the gut.

    Gregor Reid;Robert Friendship

  • Associations among antimicrobial drug treatments and antimicrobial resistance of fecal Escherichia coli of swine on 34 farrow-to-finish farms in Ontario, Canada

    R.H Dunlop;S.A McEwen;A.H Meek;R.C Clarke

  • In vitro assessment of antimicrobial activity of carvacrol, thymol and cinnamaldehyde towards Salmonella serotype Typhimurium DT104: effects of pig diets and emulsification in hydrocolloids

    W. Si;J. Gong;C. Chanas;S. Cui

  • Prevalence of Actinobacillus pleuropneumoniae, Actinobacillus suis, Haemophilus parasuis, Pasteurella multocida, and Streptococcus suis in representative Ontario swine herds

    Janet I. MacInnes;Marcelo Gottschalk;Abdul G. Lone;Devon S. Metcalf

  • Prevalence of hepatitis E virus antibodies in Canadian swine herds and identification of a novel variant of swine hepatitis E virus.

    D. Yoo;P. Willson;Y. Pei;M. A. Hayes

  • Longitudinal investigation of Clostridium difficile shedding in piglets.

    J. Scott Weese;Terra Wakeford;Richard Reid-Smith;Joyce Rousseau

  • Prevalence of Salmonella spp. on Canadian pig farms using liquid or dry-feeding.

    Abdolvahab Farzan;Robert M. Friendship;Catherine E. Dewey;Keith Warriner

  • Chloramphenicol and kanamycin resistance among porcine Escherichia coli in Ontario

    Rebeccah M Travis;Carlton L Gyles;Richard Reid-Smith;Cornelis Poppe

  • Prevalence of and risk factors for influenza in southern Ontario swine herds in 2001 and 2003.

    Zvonimir Poljak;Catherine E. Dewey;S. Wayne Martin;Jette Christensen

  • Clinical and postmortem examination of sows culled for lameness.

    Catherine E. Dewey;Robert M. Friendship;Michael R. Wilson

  • Individual and group antimicrobial usage rates on 34 farrow-to-finish swine farms in Ontario, Canada

    R.H Dunlop;S.A McEwen;A.H Meek;W.D Black

  • A Survey of Productivity and its Component Interrelationships in Canadian Swine Herds

    M. R. Wilson;R. M. Friendship;I. McMillan;R. R. Hacker

  • Methicillin-resistant Staphylococcus aureus in commercial swine herds is associated with disinfectant and zinc usage

    Mackenzie Jonathan Slifierz;Robert M. Friendship;J. Scott Weese

  • Occurrence of Salmonella, Campylobacter, Yersinia enterocolitica, Escherichia coli O157 and Listeria monocytogenes in swine.

    A. Farzan;R. M. Friendship;A. Cook;F. Pollari

  • An investigation of iron deficiency and anemia in piglets and the effect of iron status at weaning on post-weaning performance

    Amanda M. Perri;Robert M. Friendship;John C. S. Harding;Terri L. O’Sullivan

  • Development of cerebrospinal fluid absorption sites in the pig and rat: connections between the subarachnoid space and lymphatic vessels in the olfactory turbinates.

    Lena Koh;Andrei Zakharov;Gurjit Nagra;Dianna Armstrong

  • Sow wastage: reasons for and effect on productivity.

    R M Friendship;M R Wilson;G W Almond;I McMillan

  • Effect of single or double insemination on fertility of sows bred at an induced estrus and ovulation

    Glen Cassar;Roy N. Kirkwood;Zvonimir Poljak;Kristina Bennett-Steward

Frequent Co-Authors

Catherine E. Dewey
Catherine E. Dewey University of Guelph
Roy N. Kirkwood
Roy N. Kirkwood University of Adelaide
Tina M. Widowski
Tina M. Widowski University of Guelph
J. Scott Weese
J. Scott Weese University of Guelph
David L. Pearl
David L. Pearl University of Guelph
Scott A. McEwen
Scott A. McEwen University of Guelph
Carlton L. Gyles
Carlton L. Gyles University of Guelph
Richard J. Reid-Smith
Richard J. Reid-Smith Public Health Agency of Canada
Olaf Berke
Olaf Berke University of Guelph
S. Wayne Martin
S. Wayne Martin University of Guelph

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