World's Best Scientists 2026 revealed!
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Animal Science and Veterinary
USA
2023

D-Index & Metrics

Animal Science and Veterinary

D-Index
64
Citations
13350
World Ranking
255
National Ranking
86

Jeffrey L. Firkins 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 Jeffrey L. Firkins 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: 177 publications — 67th percentile

67% of scientists in this discipline score the same or lower.

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

Jeffrey L. Firkins 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 Jeffrey L. Firkins 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: 64 D-Index — 92nd percentile

92% of scientists in this discipline score the same or lower.

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

Research.com Recognitions

  • 2023 - Research.com Animal Science and Veterinary in United States Leader Award
  • 2020 - American Dairy Science Association Fellowship Award
  • 2012 - American Feed Industry Association Award, American Dairy Science Association

Overview

What is he best known for?

The fields of study he is best known for:

  • Bacteria
  • Biochemistry
  • Gene

Jeffrey L. Firkins spends much of his time researching Rumen, Food science, Digestion, Dairy cattle and Neutral Detergent Fiber. His Rumen research is multidisciplinary, incorporating perspectives in Dry matter, Animal science and Nutrient. His Nutrient research includes themes of Silage, Forage and Metabolism.

His work carried out in the field of Silage brings together such families of science as Feed conversion ratio and Latin square. His Digestion research incorporates themes from Protein degradation and Starch. His Dairy cattle research is multidisciplinary, incorporating elements of Microbial metabolism, Defaunation, Microbiology, Biomass and Metagenomics.

His most cited work include:

  • Special topics--Mitigation of methane and nitrous oxide emissions from animal operations: I. A review of enteric methane mitigation options. (448 citations)
  • Development of an Assay to Quantify Rumen Ciliate Protozoal Biomass in Cows Using Real-Time PCR (252 citations)
  • Effects of grain variability and processing on starch utilization by lactating dairy cattle (190 citations)

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

His primary scientific interests are in Rumen, Food science, Animal science, Dry matter and Neutral Detergent Fiber. His Rumen research integrates issues from Silage, Dairy cattle and Forage. The Digestion and Tallow research Jeffrey L. Firkins does as part of his general Food science study is frequently linked to other disciplines of science, such as Unsaturated fat, therefore creating a link between diverse domains of science.

In his study, which falls under the umbrella issue of Animal science, Greenhouse gas is strongly linked to Agronomy. His biological study spans a wide range of topics, including Urea and Methanogenesis. His research integrates issues of Starch and Isovalerate in his study of Neutral Detergent Fiber.

He most often published in these fields:

  • Rumen (58.99%)
  • Food science (43.17%)
  • Animal science (32.37%)

What were the highlights of his more recent work (between 2014-2021)?

  • Rumen (58.99%)
  • Animal science (32.37%)
  • Neutral Detergent Fiber (28.06%)

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

Jeffrey L. Firkins focuses on Rumen, Animal science, Neutral Detergent Fiber, Dry matter and Food science. The concepts of his Rumen study are interwoven with issues in Ciliate, Protozoa and Bacteria. His research in the fields of Dairy cattle overlaps with other disciplines such as Mean squared prediction error and Polynomial regression.

His Neutral Detergent Fiber study combines topics from a wide range of disciplines, such as Silage, Starch and Isovalerate. Jeffrey L. Firkins has included themes like Methanogenesis, Propionate, Ammonium and Latin square in his Dry matter study. His study of Digestion is a part of Food science.

Between 2014 and 2021, his most popular works were:

  • New roles in hemicellulosic sugar fermentation for the uncultivated Bacteroidetes family BS11 (56 citations)
  • Interspecies cross-feeding orchestrates carbon degradation in the rumen ecosystem (55 citations)
  • Meta-analysis of postruminal microbial nitrogen flows in dairy cattle. I. Derivation of equations (47 citations)

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

  • Bacteria
  • Biochemistry
  • Gene

Jeffrey L. Firkins mainly investigates Rumen, Biochemistry, Biotechnology, Bacteria and Starch. He brings together Rumen and Microbial food web to produce work in his papers. His Fermentation and Glycolysis study, which is part of a larger body of work in Biochemistry, is frequently linked to NAD+ kinase, bridging the gap between disciplines.

His Biotechnology research is multidisciplinary, relying on both Fiber, Neutral Detergent Fiber, Forage and Animal science. In Bacteria, Jeffrey L. Firkins works on issues like Protozoa, which are connected to Food science, Carbohydrate, Carbohydrate synthesis and Butyrate. His Starch research incorporates elements of Dairy cattle and Dry matter.

Best Publications

  • Special topics--Mitigation of methane and nitrous oxide emissions from animal operations: I. A review of enteric methane mitigation options.

    A. N. Hristov;J. Oh;J. L. Firkins;J. Dijkstra

  • Development of an Assay to Quantify Rumen Ciliate Protozoal Biomass in Cows Using Real-Time PCR

    John T. Sylvester;Sanjay K. R. Karnati;Zhongtang Yu;Mark Morrison

  • Mitigation of greenhouse gas emissions in livestock production - A review of technical options for non-CO2 emissions

    A.N. Hristov;J. Oh;C. Lee;R. Meinen

  • Technical options for the mitigation of direct methane and nitrous oxide emissions from livestock: a review

    P.J. Gerber;A.N. Hristov;B.L. Henderson;H.P.S. Makkar

  • Mitigation of methane and nitrous oxide emissions from animal operations: III. A review of animal management mitigation options

    A.N. Hristov;T. Ott;J. Tricarico;A. Rotz

  • Ruminal nitrogen metabolism: perspectives for integration of microbiology and nutrition for dairy.

    J.L. Firkins;Z. Yu;M. Morrison

  • Effects of grain variability and processing on starch utilization by lactating dairy cattle

    J. L. Firkins;M. L. Eastridge;N. R. St-Pierre;S. M. Noftsger

  • Special topics--Mitigation of methane and nitrous oxide emissions from animal operations: III. A review of animal management mitigation options.

    A. N. Hristov;T. Ott;J. Tricarico;A. Rotz

  • Effects of Fat Saturation and Source of Fiber on Site of Nutrient Digestion and Milk Production by Lactating Dairy Cows

    J. Pantoja;J.L. Firkins;M.L. Eastridge;B.L. Hull

  • Influence of diet composition, dry-matter intake, milk production and energy balance on time of post-partum ovulation and fertility in dairy cows

    M. C. Lucy;C. R. Staples;W. W. Thatcher;Peter S. Erickson

  • Evaluation of Chemical and Physical Properties of Feeds That Affect Protein Metabolism In the Rumen

    M.D. Stern;G.A. Varga;J.H. Clark;J.L. Firkins

  • Effects of feeding nonforage fiber sources on site of fiber digestion.

    Jeffrey L. Firkins

  • Evaluation of wet and dry distillers grains and wet and dry corn gluten feeds for ruminants

    J. L. Firkins;L. L. Berger;G. C. Fahey

  • Maximizing microbial protein synthesis in the rumen.

    Jeffrey L. Firkins

  • Interspecies cross-feeding orchestrates carbon degradation in the rumen ecosystem

    Lindsey M. Solden;Adrian E. Naas;Simon Roux;Rebecca A. Daly

  • Integration of ruminal metabolism in dairy cattle.

    J. L. Firkins;Alexander Nikolov Hristov;M. B. Hall;G. A. Varga

  • Effects of urea infusion and ruminal degradable protein concentration on microbial growth, digestibility, and fermentation in continuous culture

    K. E. Griswold;G. A. Apgar;J. Bouton;J. L. Firkins

  • Effects of varying forage and concentrate carbohydrates on nutrient digestibilities and milk production by dairy cows.

    M. Sarwar;J.L. Firkins;M.L. Eastridge

  • Effect of intake and forage level on ruminal turnover rates, bacterial protein synthesis and duodenal amino acid flows in sheep.

    Neal R Merchen;J. L. Firkins;L. L. Berger

  • Modeling ruminal digestibility of carbohydrates and microbial protein flow to the duodenum.

    J.L. Firkins;M.S. Allen;B.S. Oldick;N.R. St-Pierre

  • Effects of degree of fat saturation on fiber digestion and microbial protein synthesis when diets are fed twelve times daily.

    B S Oldick;J L Firkins

  • Effect of replacing neutral detergent fiber of forage with soyhulls and corn gluten feed for dairy heifers

    M. Sarwar;J.L. Firkins;M.L. Eastridge

  • New roles in hemicellulosic sugar fermentation for the uncultivated Bacteroidetes family BS11

    Lindsey M Solden;David W Hoyt;William B Collins;Johanna E Plank

  • Site of nutrient digestion by dairy cows fed corn of different particle sizes or steam-rolled

    S.L. Callison;J.L. Firkins;M.L. Eastridge;B.L. Hull

  • Kinetics of hydration and functional specific gravity of fibrous feed by-products.

    S A Bhatti;J L Firkins

Frequent Co-Authors

M.L. Eastridge
M.L. Eastridge The Ohio State University
Zhongtang Yu
Zhongtang Yu The Ohio State University
N.R. St-Pierre
N.R. St-Pierre The Ohio State University
Alexander N. Hristov
Alexander N. Hristov Pennsylvania State University
Chanhee Lee
Chanhee Lee The Ohio State University
William P. Weiss
William P. Weiss The Ohio State University
Ermias Kebreab
Ermias Kebreab University of California, Davis
Paul J. Kononoff
Paul J. Kononoff University of Nebraska–Lincoln
Adegbola T. Adesogan
Adegbola T. Adesogan University of Florida
Jan Dijkstra
Jan Dijkstra Wageningen University & Research

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Related Online Degrees & Career Pathways

Pursuing a degree in Animal Science or Veterinary studies opens doors to diverse career paths, many of which extend beyond traditional veterinary roles. For those interested in the behavioral aspects of animal care and human-animal interactions, exploring psychology-related fields can be beneficial. Programs like nasp school psychology programs offer insights into developmental and behavioral support, which can complement animal science knowledge in roles such as therapy animal coordination or rehabilitation.

If you’re considering advanced studies, online apa accredited psyd programs provide a pathway to clinical expertise, useful for those interested in counseling roles that emphasize human well-being alongside animal-assisted therapy.

Many students also find a rewarding career in addressing complex social issues by obtaining specialized qualifications such as an online addiction counseling degree. These skills are valuable in veterinary contexts where addressing substance abuse and mental health in animal owners can impact animal care outcomes.

Finally, mft master’s programs online provide training in relationship dynamics, which are increasingly relevant in animal-assisted family therapy and community health initiatives involving animals. Together, these pathways enrich the traditional veterinary landscape with broader, impactful career opportunities.

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