World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
69
Citations
15101
World Ranking
7490
National Ranking
3411

Leon J. Spicer publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where Leon J. Spicer sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 257 publications — 69th percentile

69% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

Leon J. Spicer D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Leon J. Spicer sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 69 D-Index — 63rd percentile

63% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Overview

Leon J. Spicer is affiliated with Oklahoma State University in the United States, focusing on research in the fields of Biochemistry, Genetics and Molecular Biology, as well as Agricultural and Biological Sciences. Their work spans 28 publications in the former field and 26 in the latter.

Their research covers several subfields including Molecular Biology, Agronomy and Crop Science, Genetics, Plant Science, and Ecology, Evolution, Behavior and Systematics. The main topics addressed in their publications include:

  • Reproductive Physiology in Livestock
  • Kruppel-like factors research
  • Animal Genetics and Reproduction
  • Mycotoxins in Agriculture and Food
  • Reproductive Biology and Fertility
  • Plant and fungal interactions
  • Growth Hormone and Insulin-like Growth Factors

Leon J. Spicer has coauthored with several frequent collaborators, among them:

  • Excel Rio S. Maylem
  • L.F. Schütz
  • F. Caloni
  • Isadora Maria Batalha
  • Eufrocina P. Atabay

Their research has been published most often in these venues:

  • Journal of Animal Science
  • Toxins
  • Theriogenology
  • Animal Reproduction Science
  • Domestic Animal Endocrinology

Among their recent papers are the following:

  • "Discovery of a possible role of asprosin in ovarian follicular function," 2020, Journal of Molecular Endocrinology
  • "Emerging mycotoxins and reproductive effects in animals: A short review," 2022, Journal of Applied Toxicology
  • "Enniatin B1: Emerging Mycotoxin and Emerging Issues," 2023, Toxins
  • "A potential role of fibrillin-1 (FBN1) mRNA and asprosin in follicular development in water buffalo," 2021, Theriogenology
  • "Branched-chain amino acids partially recover the reduced growth of pigs fed with protein-restricted diets through both central and peripheral factors," 2021, Animal nutrition

Best Publications

  • The ovarian insulin and insulin-like growth factor system with an emphasis on domestic animals

    L.J. Spicer;S.E. Echternkamp

  • The adipose obese gene product, leptin: evidence of a direct inhibitory role in ovarian function.

    Leon J. Spicer;Cristina C. Francisco

  • Effects of insulin, insulin-like growth factor I, and gonadotropins on bovine granulosa cell proliferation, progesterone production, estradiol production, and(or) insulin-like growth factor I production in vitro.

    L. J. Spicer;E. Alpizar;S. E. Echternkamp

  • Insulin-like growth factor-I in dairy cows: relationships among energy balance, body condition, ovarian activity, and estrous behavior.

    L.J. Spicer;W.B. Tucker;G.D. Adams

  • Concentrations of insulin-like growth factor-I in blood and ovarian follicular fluid of cattle selected for twins.

    S E Echternkamp;L J Spicer;K E Gregory;S F Canning

  • INFLUENCE OF BODY CONDITION AT CALVING AND POSTPARTUM NUTRITION ON ENDOCRINE FUNCTION AND REPRODUCTIVE PERFORMANCE OF PRIMIPAROUS BEEF COWS

    N. H. Ciccioli;R. P. Wettemann;L. J. Spicer;C. A. Lents

  • Leptin: a possible metabolic signal affecting reproduction.

    Leon J. Spicer

  • Effect of dietary intake on pattern of growth of dominant follicles during the oestrous cycle in beef heifers.

    M. G. Murphy;W. J. Enright;M. A. Crowe;K. McConnell

  • Effect of Calf Isolation on Follicular Wave Dynamics, Gonadotropin and Metabolic Hormone Changes, and Interval to First Ovulation in Beef Cows Fed Either of Two Energy Levels Postpartum

    K. Stagg;L.J. Spicer;J.M. Sreenan;J.F. Roche

  • Adipose obese gene product, leptin, inhibits bovine ovarian thecal cell steroidogenesis.

    Leon J. Spicer;Cristina C. Francisco

  • Development of a culture system for bovine granulosa cells: effects of growth hormone, estradiol, and gonadotropins on cell proliferation, steroidogenesis, and protein synthesis.

    D J Langhout;L J Spicer;R D Geisert

  • Effects of insulin-like growth factor I and insulin on proliferation and on basal and luteinizing hormone-induced steroidogenesis of bovine thecal cells: involvement of glucose and receptors for insulin-like growth factor I and luteinizing hormone.

    R E Stewart;L J Spicer;T D Hamilton;B E Keefer

  • Levels of insulin-like growth factor (IGF) binding proteins, luteinizing hormone and IGF-I receptors, and steroids in dominant follicles during the first follicular wave in cattle exhibiting regular estrous cycles.

    R E Stewart;L J Spicer;T D Hamilton;B E Keefer

  • Nutritionally induced anovulation in beef heifers: ovarian and endocrine function preceding cessation of ovulation.

    I Bossis;R P Wettemann;S D Welty;J A Vizcarra

  • Ovarian follicular growth, function and turnover in cattle: a review.

    L. J. Spicer;L. J. Spicer;S. E. Echternkamp;S. E. Echternkamp

  • Ovarian and endocrine characteristics during an estrous cycle in Angus, Brahman, and Senepol cows in a subtropical environment.

    P Alvarez;L J Spicer;C C Chase;M E Payton

  • The role of endocrine insulin-like growth factor-I (IGF-I) in female bovine reproduction

    M.A. Velazquez;L.J. Spicer;D.C. Wathes

  • Role of adiponectin in regulating ovarian theca and granulosa cell function.

    Dana V. Lagaly;Pauline Y. Aad;Juan A. Grado-Ahuir;Laura B. Hulsey

  • Effect of nutrition and superovulation on oocyte morphology, follicular fluid composition and systemic hormone concentrations in ewes

    Diarmuid O'Callaghan;Halimatun Yaakub;Poul Hyttel;Leon J. Spicer

  • Luteinizing hormone, growth hormone, insulin-like growth factor-I, insulin and metabolites before puberty in heifers fed to gain at two rates.

    J. V. Yelich;Robert P. Wettemann;T. T. Marston;L. J. Spicer

Frequent Co-Authors

R. P. Wettemann
R. P. Wettemann Oklahoma State University
Rodney D. Geisert
Rodney D. Geisert University of Missouri
James F. Roche
James F. Roche University College Dublin
Duane H. Keisler
Duane H. Keisler University of Missouri
James J. Ireland
James J. Ireland Michigan State University
Maurice P. Boland
Maurice P. Boland University College Dublin
Mark E. Payton
Mark E. Payton Oklahoma State University
Nathan M. Long
Nathan M. Long Clemson University
Keith E. Gregory
Keith E. Gregory United States Department of Agriculture
Samuel W. Coleman
Samuel W. Coleman United States Department of Agriculture

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