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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Animal Science and Veterinary 36 1651 1519 478 405 57 4203

James E. Keen publications per year

The chart shows the history of publications by James E. Keen between 1995 and 2019, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. James E. Keen published across 25 years, from 1995 to 2019, averaging 2.3 papers a year. Output peaked at 6 publications in 2004. 1 of the 58 publications appeared in the last two years.

No. of publications
2 4 6
Bar chart. Horizontal axis: year, 1995 to 2019. Vertical axis: number of publications, 0 to 6. Peak 6 publications in 2004. 1995: 4 publications 1996: 4 publications 1997: 2 publications 1998: 2 publications 1999: 2 publications 2000: 1 publication 2001: 5 publications 2002: 5 publications 2003: 1 publication 2004: 6 publications 2005: 4 publications 2006: 4 publications 2007: 6 publications 2008: 1 publication 2009: 4 publications 2010: 3 publications 2011: 0 publications 2012: 2 publications 2013: 0 publications 2014: 1 publication 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 1 publication
1995 2019

58 publications in total across all disciplines

View publications per year as a table
James E. Keen: publications per year, 1995 to 2019
Year Publications
1995 4
1996 4
1997 2
1998 2
1999 2
2000 1
2001 5
2002 5
2003 1
2004 6
2005 4
2006 4
2007 6
2008 1
2009 4
2010 3
2011 0
2012 2
2013 0
2014 1
2015 0
2016 0
2017 0
2018 0
2019 1
Total 58
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James E. Keen 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 James E. Keen sits on this spectrum.

No. of scientists
25 50 75 100
Bar chart with 84 bars. Horizontal axis: publications, 29–33 to 442+. Vertical axis: number of scientists, 0 to 109. Most scientists, 109, have 119–123 publications. The last bar groups every scientist with 442 publications or more. The highlighted bar, 54–58 publications, is where this scientist sits. 29–33 publications: 1 scientist 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
29–33 publications 442+

This scientist: 57 publications — 3rd percentile

3% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Animal Science and Veterinary scientists by publication count, Research.com 2026 ranking edition. Based on 3,155 ranked scientists.
Publications Scientists This scientist
29–33 1
34–38 6
39–43 17
44–48 23
49–53 28
54–58 44 57
59–63 66
64–68 75
69–73 71
74–78 85
79–83 108
84–88 105
89–93 84
94–98 103
99–103 97
104–108 95
109–113 89
114–118 88
119–123 109
124–128 93
129–133 89
134–138 95
139–143 92
144–148 80
149–153 75
154–158 74
159–163 67
164–168 53
169–173 62
174–178 63
179–183 50
184–188 55
189–193 50
194–198 27
199–203 44
204–208 31
209–213 28
214–218 38
219–223 33
224–228 36
229–233 29
234–238 35
239–243 23
244–248 24
249–253 29
254–258 28
259–263 21
264–268 25
269–273 11
274–278 18
279–283 13
284–288 18
289–293 10
294–298 12
299–303 11
304–308 15
309–313 14
314–318 14
319–323 8
324–328 8
329–333 13
334–338 14
339–343 13
344–348 10
349–353 11
354–358 5
359–363 8
364–368 8
369–373 6
374–378 7
379–383 8
384–388 3
389–393 4
394–398 5
399–403 8
404–408 5
409–413 4
414–418 3
419–423 8
424–428 5
429–433 3
434–438 5
439–441 5
442+ 99
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James E. Keen 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 James E. Keen sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 58 bars. Horizontal axis: D-Index, 20 to 77+. Vertical axis: number of scientists, 0 to 158. Most scientists, 158, have 31 D-Index. The last bar groups every scientist with 77 D-Index or more. The highlighted bar, 36 D-Index, is where this scientist sits. 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: 36 D-Index — 50th percentile

50% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Animal Science and Veterinary scientists by D-index, Research.com 2026 ranking edition. Based on 3,155 ranked scientists.
D-Index Scientists This scientist
20 5
21 22
22 31
23 44
24 53
25 66
26 80
27 101
28 106
29 116
30 154
31 158
32 143
33 137
34 126
35 134
36 112 36
37 115
38 105
39 111
40 107
41 87
42 74
43 62
44 61
45 41
46 51
47 43
48 28
49 47
50 40
51 34
52 33
53 43
54 16
55 32
56 21
57 18
58 28
59 33
60 17
61 21
62 18
63 21
64 9
65 20
66 11
67 16
68 12
69 17
70 13
71 15
72 11
73 11
74 14
75 5
76 6
77+ 100
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Overview

James E. Keen is affiliated with the United States Department of Agriculture in the United States. Their research focuses primarily on the fields of Agricultural and Biological Sciences as well as Medicine, with specific concentration in subfields such as Agronomy and Crop Science, Ecology, Evolution, Behavior and Systematics, and Cardiology and Cardiovascular Medicine.

Their main topics of work include Animal Disease Management and Epidemiology, Vector-Borne Animal Diseases, and Viral Infections and Immunology Research. These themes are reflected in their published works and collaborations.

James E. Keen has published research in venues like Revue Scientifique et Technique de l OIE. One of their recent papers is titled "The epidemiological status of African swine fever in domestic swine herds in the Tavush Province region, Armenia," published in 2020 in Revue Scientifique et Technique de l OIE.

  • The epidemiological status of African swine fever in domestic swine herds in the Tavush Province region, Armenia (2020, Revue Scientifique et Technique de l OIE)

Keen has frequently collaborated with coauthors including Tigran Markosyan, Kh. V. Sargsyan, Satenik Kharatyan, Hasmik Elbakyan, and Varduhi Hakobyan.

  • Tigran Markosyan
  • Kh. V. Sargsyan
  • Satenik Kharatyan
  • Hasmik Elbakyan
  • Varduhi Hakobyan

Best Publications

  • Prevalence of Escherichia coli O157:H7 in range beef calves at weaning.

    W. W. Laegreid;R. O. Elder;J. E. Keen

  • Forage Feeding to Reduce Preharvest Escherichia coli Populations in Cattle, a Review

    T.R. Callaway;R.O. Elder;J.E. Keen;R.C. Anderson

  • Animal-to-Animal Variation in Fecal Microbial Diversity among Beef Cattle

    Lisa M. Durso;Gregory P. Harhay;Timothy P. L. Smith;James L. Bono

  • Isolation of shiga-toxigenic Escherichia coli O157 from hide surfaces and the oral cavity of finished beef feedlot cattle.

    James E. Keen;Robert O. Elder

  • Mutations in the csgD Promoter Associated with Variations in Curli Expression in Certain Strains of Escherichia coli O157:H7

    Gaylen A. Uhlich;James E. Keen;Robert O. Elder

  • Bacteriophage isolated from feedlot cattle can reduce Escherichia coli O157:H7 populations in ruminant gastrointestinal tracts.

    Todd R. Callaway;Tom S. Edrington;Andrew D. Brabban;Robin C. Anderson

  • Shiga-toxigenic Escherichia coli O157 in agricultural fair livestock, United States.

    James E. Keen;Thomas E. Wittum;John R. Dunn;James L. Bono

  • Variations in the csgD Promoter of Escherichia coli O157:H7 Associated with Increased Virulence in Mice and Increased Invasion of HEp-2 Cells

    Gaylen A. Uhlich;James E. Keen;Robert O. Elder

  • Prevalence of fecal shedding of Salmonella spp in dairy herds.

    Carla L. Huston;Thomas E. Wittum;Brenda C. Love;James E. Keen

  • Longitudinal study of Escherichia coli O157:H7 in a beef cattle feedlot and role of high-level shedders in hide contamination.

    Terrance M. Arthur;James E. Keen;James E. Keen;Joseph M. Bosilevac;Dayna M. Brichta-Harhay

  • Reduced Lentivirus Susceptibility in Sheep with TMEM154 Mutations

    Michael P. Heaton;Michael L. Clawson;Carol G. Chitko-Mckown;Kreg A. Leymaster

  • Association of neonatal serum immunoglobulin G1 concentration with health and performance in beef calves

    Unknown

  • Fecal prevalence of Escherichia coli O157, Salmonella, Listeria, and Bacteriophage Infecting E. coli O157:H7 in feedlot cattle in the Southern Plains region of the United States.

    T.R. Callaway;T.S. Edrington;A.D. Brabban;J.E. Keen

  • Fecal prevalence and diversity of Salmonella species in lactating dairy cattle in four states.

    T.R. Callaway;J.E. Keen;T.S. Edrington;L.H. Baumgard

  • Genotypic Analyses of Escherichia coli O157:H7 and O157 Nonmotile Isolates Recovered from Beef Cattle and Carcasses at Processing Plants in the Midwestern States of the United States

    Genevieve A. Barkocy-Gallagher;Terrance M. Arthur;Gregory R. Siragusa;James E. Keen

  • Genetic diversity among clonal lineages within Escherichia coli O157:H7 stepwise evolutionary model.

    Peter C.H. Feng;Steven R. Monday;David W. Lacher;Lesley Allison

  • Association of bovine neonatal Fc receptor alpha-chain gene (FCGRT) haplotypes with serum IgG concentration in newborn calves.

    William W Laegreid;Michael P Heaton;James E Keen;William M Grosse

  • Association of Escherichia coli O157:H7 tir polymorphisms with human infection

    James L Bono;James E Keen;Michael L Clawson;Lisa M Durso

  • Outbreak of escherichia coli O157: H7 infections after Petting Zoo visits, North Carolina State Fair, October-November 2004.

    Brant Goode;Ciara O’Reilly;John Dunn;Kathleen Fullerton

  • Shiga-Toxigenic Escherichia coli O157:H7 Infections among Livestock Exhibitors and Visitors at a Texas County Fair

    Lisa M. Durso;Kaye Reynolds;Nate Bauer;James E. Keen

  • Prevalence of Shiga-toxigenic Escherichia coli O157:H7 in adult dairy cattle.

    John R Dunn;James E Keen;R Alex Thompson

  • Effect of ewe ovine lentivirus infection on ewe and lamb productivity

    J.E Keen;L.L Hungerford;E.T Littledike;T.E Wittum

  • Use of bovine single nucleotide polymorphism markers to verify sample tracking in beef processing.

    Michael P. Heaton;James E. Keen;Michael L. Clawson;Gregory P. Harhay

  • Prevalence of Escherichia coli O157:H7 in white-tailed deer from Louisiana.

    John R. Dunn;John R. Dunn;James E. Keen;David Moreland;R. Alex Thompson;R. Alex Thompson

  • Phylogenetic classification of Escherichia coli O157:H7 strains of human and bovine origin using a novel set of nucleotide polymorphisms

    Michael L Clawson;James E Keen;James E Keen;Timothy P L Smith;Lisa M Durso

  • Molecular Serotyping of Escherichia coli O26:H11

    Lisa M. Durso;James L. Bono;James E. Keen

  • Interleukin-8 haplotype structure from nucleotide sequence variation in commercial populations of U.S. beef cattle.

    Michael P. Heaton;Carol G. Chitko-McKown;W. Michael Grosse;John W. Keele

Frequent Co-Authors

Mohammad Koohmaraie
Mohammad Koohmaraie IEH Laboratories and Consulting Group
Thomas E. Wittum
Thomas E. Wittum The Ohio State University
Timothy P. L. Smith
Timothy P. L. Smith Agricultural Research Service
Terrance M. Arthur
Terrance M. Arthur United States Department of Agriculture
Gregory R. Siragusa
Gregory R. Siragusa Scout Microbiology
John W. Keele
John W. Keele Agricultural Research Service
Gary L. Bennett
Gary L. Bennett Agricultural Research Service
Catherine N. Cutter
Catherine N. Cutter Pennsylvania State University
Steven D. Shackelford
Steven D. Shackelford Agricultural Research Service
Tommy L. Wheeler
Tommy L. Wheeler United States Department of Agriculture

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