World's Best Scientists 2026 revealed!
Ryan M. O'Handley

Ryan M. O'Handley

D-Index & Metrics

Animal Science and Veterinary

D-Index
29
Citations
3589
World Ranking
2557
National Ranking
139

Ryan M. O'Handley 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 Ryan M. O'Handley 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: 66 publications — 7th percentile

7% of scientists in this discipline score the same or lower.

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

Ryan M. O'Handley 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 Ryan M. O'Handley 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: 29 D-Index — 20th percentile

20% of scientists in this discipline score the same or lower.

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

Overview

Ryan M. O'Handley is a researcher affiliated with the University of Adelaide in Australia. Their work primarily focuses on the fields of Immunology and Microbiology, Medicine, and Agricultural and Biological Sciences. Within these domains, they have concentrated extensively on parasitology, agronomy and crop science, infectious diseases, epidemiology, and ecology, evolution, behavior, and systematics.

Their research topics cover a range of areas including Toxoplasma gondii research studies, parasitic infections and diagnostics, animal disease management and epidemiology, herpesvirus infections and treatments, parasitic diseases research and treatment, vector-borne animal diseases, and mosquito-borne diseases and control.

O'Handley has contributed to numerous publications, with frequent appearances in the following scientific venues:

  • Australian Veterinary Journal
  • Veterinary Parasitology
  • Preventive Veterinary Medicine
  • Parasites & Vectors
  • Animals

Some recent papers authored or co-authored by O'Handley include the following:

  • Behavioral biology of Toxoplasma gondii infection, 2021, Parasites & Vectors
  • Anthelmintic resistance of gastrointestinal nematodes in goats: A systematic review and meta-analysis, 2022, Veterinary Parasitology
  • Abortion and Lamb Mortality between Pregnancy Scanning and Lamb Marking for Maiden Ewes in Southern Australia, 2021, Animals
  • Ehrlichia canis rapid spread and possible enzooty in northern South Australia and distribution of its vector Rhipicephalus linnaei, 2022, Australian Veterinary Journal
  • Neospora caninum is not an important contributor to poor reproductive performance of primiparous ewes from southern Australia: evidence from a cross-sectional study, 2021, Parasitology Research

O'Handley's frequent co-authors include:

  • Colin Trengove
  • Amy Lockwood
  • Serina Hancock
  • A. N. Thompson
  • Sue Beetson

Best Publications

  • Update on Cryptosporidium and Giardia infections in cattle

    Merle E Olson;Ryan M O'Handley;Brenda J Ralston;Timothy A McAllister

  • The public health and clinical significance of Giardia and Cryptosporidium in domestic animals.

    R.C. Andrew Thompson;Carlysle S. Palmer;Ryan O’Handley

  • Duration of naturally acquired giardiosis and cryptosporidiosis in dairy calves and their association with diarrhea.

    R M O'Handley;C Cockwill;T A McAllister;M Jelinski

  • Prevalence and genotypic characterisation of Giardia in dairy calves from Western Australia and Western Canada.

    R.M. O'Handley;M.E. Olson;D. Fraser;P.J. Adams

  • Ixodes scapularis Ticks Collected by Passive Surveillance in Canada: Analysis of Geographic Distribution and Infection with Lyme Borreliosis Agent Borrelia burgdorferi

    N. H. Ogden;N. H. Ogden;L. Trudel;H. Artsob;I. K. Barker

  • Giardia and Cryptosporidium in dairy calves in British Columbia.

    M E Olson;N J Guselle;R M O'Handley;M L Swift

  • Giardiasis and cryptosporidiosis in ruminants.

    Ryan M. O'Handley;Merle E. Olson;Merle E. Olson

  • Comparative susceptibility of planktonic and 3-day-old Salmonella Typhimurium biofilms to disinfectants

    H.S. Wong;K.M. Townsend;S.G. Fenwick;R.D. Trengove

  • Neospora caninum-like oocysts observed in feces of free-ranging red foxes (Vulpes vulpes) and coyotes (Canis latrans).

    Wendela Wapenaar;Mark C. Jenkins;Ryan M. O'Handley;Herman W. Barkema

  • Zoonotic potential of Giardia duodenalis and Cryptosporidium spp. and prevalence of intestinal parasites in young dogs from different populations on Prince Edward Island, Canada

    Fabienne D Uehlinger;Spencer J Greenwood;J Trenton McClure;Gary Conboy

  • Behavioral biology of Toxoplasma gondii infection.

    Wen Han Tong;Chris Pavey;Ryan O’Handley;Ajai Vyas

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

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

  • Giardia duodenalis Assemblage-Specific Induction of Apoptosis and Tight Junction Disruption in Human Intestinal Epithelial Cells: Effects of Mixed Infections

    Wan Hon Koh;Thomas Geurden;Tim Paget;Ryan O'Handley

  • Seroprevalence of Toxoplasma gondii in wild kangaroos using an ELISA.

    N. Parameswaran;R.M. O'Handley;M.E. Grigg;S.G. Fenwick

  • EXPERIMENTAL INFECTION OF SHEEP WITH NEOSPORA CANINUM OOCYSTS

    Ryan O'Handley;Susan Liddell;Carolyn Parker;Mark C. Jenkins

  • Giardia duodenalis and Cryptosporidium spp. in a veterinary college bovine teaching herd

    Fabienne D. Uehlinger;Herman W. Barkema;Brent R. Dixon;Tatjana Coklin

  • Giardiasis in dairy calves: effects of fenbendazole treatment on intestinal structure and function.

    R.M O'Handley;A.G Buret;T.A McAllister;M Jelinski

  • Efficacy of fenbendazole for treatment of giardiasis in calves.

    R M O'Handley;M E Olson;T A McAllister;D W Morck

  • Comparative susceptibility of Salmonella Typhimurium biofilms of different ages to disinfectants

    Hui San Wong;Kirsty M Townsend;Stan G Fenwick;Garth Maker

  • Effects of repeat fenbendazole treatment in dairy calves with giardiosis on cyst excretion, clinical signs and production.

    R.M. O’Handley;C. Cockwill;M. Jelinski;T.A. McAllister

  • Passive immunity and serological immune response in dairy calves associated with natural Giardia duodenalis infections.

    Ryan M. O’Handley;Howard Ceri;Colleen Anette;Merle E. Olson

  • Prevalence and molecular characterization of Cryptosporidium spp. in dairy calves from 11 farms in Prince Edward Island, Canada

    Tatjana Coklin;Fabienne D Uehlinger;Jeffrey M Farber;Herman W Barkema;Herman W Barkema

  • Systematic review of gastrointestinal nematodes of horses from Australia

    Muhammad A. Saeed;Ian Beveridge;Ghazanfar Abbas;Anne Beasley

  • Secreted biofilm factors adversely affect cellular wound healing responses in vitro.

    Robert Jeffery Marano;Hilary Jane Wallace;Dulharie Wijeratne;Mark William Fear

  • Cryptosporidium parvum infection in cattle: are current perceptions accurate?

    Ryan M. O’Handley;Ryan M. O’Handley;Ryan M. O’Handley

  • Diagnostic significance of Neospora caninum DNA detected by PCR in cattle serum.

    Linda M. McInnes;Una M. Ryan;Ryan O’Handley;Heinz Sager

Frequent Co-Authors

Herman W. Barkema
Herman W. Barkema University of Calgary
Merle E. Olson
Merle E. Olson University of Calgary
Tim A. McAllister
Tim A. McAllister Agriculture and Agriculture-Food Canada
Brent R. Dixon
Brent R. Dixon University of Ottawa
R.C.A. Thompson
R.C.A. Thompson Murdoch University
Darren J. Trott
Darren J. Trott University of Adelaide
Jitender P. Dubey
Jitender P. Dubey Agricultural Research Service
Thomas Geurden
Thomas Geurden Zoetis (United States)
John A. VanLeeuwen
John A. VanLeeuwen University of Prince Edward Island
Mark C. Jenkins
Mark C. Jenkins United States Department of Agriculture

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Related Online Degrees & Career Pathways

Studying Animal Science and Veterinary offers diverse career options, and advancing your education online can be a flexible way to boost your qualifications. For those interested in counseling roles related to animal-assisted therapy or human-animal interactions, exploring marriage and family therapy master's programs online can be a valuable step. These programs often provide skills that complement veterinary or animal science careers.

If you aim for leadership or educational roles within veterinary or animal science fields, pursuing an online PhD counselor education and supervision might open doors to supervisory positions in clinics, animal care settings, or research institutions.

Additionally, understanding the wide array of careers with animals can help you tailor your studies toward specialties like wildlife conservation, animal behavior, or veterinary technology. This knowledge can guide you in selecting the most relevant degree or certificate programs online.

Interestingly, some animal science graduates have also pursued roles in sports and recreation management, such as becoming an athletic director, combining their leadership skills with team and facility management. This pathway highlights the versatility of animal science degrees beyond traditional veterinary careers.

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