World's Best Scientists 2026 revealed!

D-Index & Metrics

Animal Science and Veterinary

D-Index
36
Citations
5283
World Ranking
1596
National Ranking
464

P.J. Berger 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 P.J. Berger 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: 81 publications — 15th percentile

15% of scientists in this discipline score the same or lower.

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

P.J. Berger 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 P.J. Berger 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: 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.

Overview

P.J. Berger is affiliated with Iowa State University in the United States and works primarily in the fields of Environmental Science and Immunology and Microbiology. Their research focuses on several subfields, including Water Science and Technology, Parasitology, Infectious Diseases, and Health, Toxicology and Mutagenesis.

The main topics of their work include:

  • Fecal contamination and water quality
  • Parasitic Infections and Diagnostics
  • Viral gastroenteritis research and epidemiology
  • Water Treatment and Disinfection

P.J. Berger has published research in frequent collaboration with co-authors such as Jake Crosby, P. M. Wallis, Marcella Hutchinson, Mia Mattioli, and Katharine M. Benedict.

The scientist has contributed articles to several publication venues, including:

  • Journal of Microbiological Methods
  • AQUA - Water Infrastructure Ecosystems and Society
  • SSRN Electronic Journal

Among recent papers, Berger authored "Improving groundwater treatment decisions using Giardia and total aerobic spores to assess surface water influence," published in 2025 in AQUA - Water Infrastructure Ecosystems and Society.

In 2024, Berger published "Improving Drinking Water Treatment Decisions Using Giardia, Cryptosporidium, Microscopic Particulate Analysis (Diatom) and Total Aerobic Spore Detections for Ground Water Under the Direct Influence of Surface Water Determination" in the SSRN Electronic Journal.

Earlier work includes a 2020 publication in the Journal of Microbiological Methods titled "Identifying septic pollution exposure routes during a waterborne norovirus outbreak - A new application for human-associated microbial source tracking qPCR," authored by Mia Mattioli with Berger as a frequent collaborator in related research areas.

Best Publications

  • Birth weight as a predictor of calving ease and perinatal mortality in Holstein cattle.

    J.M. Johanson;P.J. Berger

  • Genetic and phenotypic parameters for 305-day yield, fertility, and survival in Holsteins.

    C.M.B. Dematawewa;P.J. Berger

  • Phenotypic trends in incidence of stillbirth for Holsteins in the United States.

    C.L. Meyer;P.J. Berger;K.J. Koehler;J.R. Thompson

  • Effect of Dystocia on Yield, Fertility, and Cow Losses and an Economic Evaluation of Dystocia Scores for Holsteins

    C.M.B. Dematawena;P.J. Berger

  • Yield and Fertility Relationships in Dairy Cattle

    Leslie B Hansen;A. E. Freeman;P. J. Berger

  • Genetic Aspects of Milk Yield and Reproductive Performance

    P.J. Berger;R.D. Shanks;A.E. Freeman;R.C. Laben

  • Interactions among factors affecting stillbirths in Holstein cattle in the United States.

    C.L. Meyer;P.J. Berger;K.J. Koehler

  • Factors Affecting Milk Yield and Reproductive Performance

    Unknown

  • Genetic aspects of lactation curves.

    R.D. Shanks;P.J. Berger;A.E. Freeman;F.N. Dickinson

  • Effect of Selection for Milk Production and General Health of the Dairy Cow

    R.D. Shanks;A.E. Freeman;P.J. Berger;D.H. Kelley

  • Factors affecting dystocia and early calf mortality in Angus cows and heifers.

    P J Berger;A C Cubas;K J Koehler;M H Healey

  • Variances, repeatabilities, and age adjustments of yield and fertility in dairy cattle.

    Leslie B Hansen;A. E. Freeman;P. J. Berger

  • Effects of Previous Days Open, Previous Days Dry, and Present Days Open on Lactation Yield

    D.A. Funk;A.E. Freeman;P.J. Berger

  • Twinning rates for North American Holstein sires.

    J.M. Johanson;P.J. Berger;B.W. Kirkpatrick;M.R. Dentine

  • Profitability in Daughters of High Versus Average Holstein Sires Selected for Milk Yield of Daughters

    J.A. Bertrand;P.J. Berger;A.E. Freeman;D.H. Kelley

  • Relationship of Reproductive Factors with Interval and Rate of Conception

    R.D. Shanks;A.E. Freeman;P.J. Berger

  • Association of heifer fertility with cow fertility and yield in dairy cattle.

    L.B. Hansen;A.E. Freeman;P.J. Berger

  • Evaluation of a Linear Type Program in Holsteins

    J.R. Thompson;A.E. Freeman;D.J. Wilson;C.A. Chapin

  • Reporting of dystocia scores and effects of dystocia on production, days open, and days dry from dairy herd improvement data.

    M. Djemali;A.E. Freeman;P.J. Berger

  • A Bayesian threshold-linear model evaluation of perinatal mortality, dystocia, birth weight, and gestation length in a Holstein herd1

    J.M. Johanson;P.J. Berger;S. Tsuruta;I. Misztal

  • Genetic relationship between calf livability and calving difficulty of Holsteins.

    Mario L. Martinez;A.E. Freeman;P.J. Berger

Frequent Co-Authors

Brian W. Kirkpatrick
Brian W. Kirkpatrick University of Wisconsin–Madison
Roger D. Shanks
Roger D. Shanks University of Illinois at Urbana-Champaign
Kent A. Weigel
Kent A. Weigel University of Wisconsin–Madison
O. W. Robison
O. W. Robison North Carolina State University
Michael D. Tokach
Michael D. Tokach Kansas State University
Thomas J. Baas
Thomas J. Baas Iowa State University
Rodger K. Johnson
Rodger K. Johnson University of Nebraska–Lincoln
R.K. Miller
R.K. Miller Texas A&M University
Kenneth J. Stalder
Kenneth J. Stalder Iowa State University
Ignacy Misztal
Ignacy Misztal University of Georgia

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Related Online Degrees & Career Pathways

For those exploring Animal Science and Veterinary fields, complementary online degrees in mental health and counseling can provide valuable interdisciplinary skills. Understanding animal behavior often intersects with psychological principles, making programs like nasp accredited school psychology programs beneficial for students seeking a broader perspective.

Additionally, pursuing advanced qualifications through apa accredited psyd programs online can equip professionals with clinical skills that support animal-assisted therapy and human-animal bond research.

Careers in vet and animal science sometimes involve addressing behavioral health issues in pet owners or clients, where expertise from an addiction counseling degree online counseling can enhance communication and treatment outcomes.

Furthermore, fields such as animal welfare and rehabilitation benefit from knowledge gained in marriage and family counseling degree online, especially when working with families to address pet-related emotional challenges.

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