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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 33 1968 1801 568 473 76 4646

D.K. Combs publications per year

The chart shows the history of publications by D.K. Combs between 1982 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. D.K. Combs published across 44 years, from 1982 to 2025, averaging 2.1 papers a year. Output peaked at 8 publications in 2016. 2 of the 91 publications appeared in the last two years.

No. of publications
2 4 6 8
Bar chart. Horizontal axis: year, 1982 to 2025. Vertical axis: number of publications, 0 to 8. Peak 8 publications in 2016. 1982: 1 publication 1983: 1 publication 1984: 1 publication 1985: 0 publications 1986: 0 publications 1987: 1 publication 1988: 0 publications 1989: 1 publication 1990: 6 publications 1991: 5 publications 1992: 3 publications 1993: 2 publications 1994: 1 publication 1995: 0 publications 1996: 4 publications 1997: 2 publications 1998: 3 publications 1999: 2 publications 2000: 4 publications 2001: 1 publication 2002: 4 publications 2003: 2 publications 2004: 0 publications 2005: 1 publication 2006: 0 publications 2007: 0 publications 2008: 3 publications 2009: 3 publications 2010: 2 publications 2011: 0 publications 2012: 0 publications 2013: 2 publications 2014: 2 publications 2015: 3 publications 2016: 8 publications 2017: 1 publication 2018: 2 publications 2019: 3 publications 2020: 2 publications 2021: 1 publication 2022: 7 publications 2023: 5 publications 2024: 1 publication 2025: 1 publication
1982 2025

91 publications in total across all disciplines

View publications per year as a table
D.K. Combs: publications per year, 1982 to 2025
Year Publications
1982 1
1983 1
1984 1
1985 0
1986 0
1987 1
1988 0
1989 1
1990 6
1991 5
1992 3
1993 2
1994 1
1995 0
1996 4
1997 2
1998 3
1999 2
2000 4
2001 1
2002 4
2003 2
2004 0
2005 1
2006 0
2007 0
2008 3
2009 3
2010 2
2011 0
2012 0
2013 2
2014 2
2015 3
2016 8
2017 1
2018 2
2019 3
2020 2
2021 1
2022 7
2023 5
2024 1
2025 1
Total 91
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D.K. Combs publications per year - data summary

  • D.K. Combs, a Animal Science and Veterinary scholar from University of Wisconsin–Madison, has 91 publications recorded across 44 years, from 1982 to 2025.
  • The oldest publication on record dates to 1982 and the most recent to 2025.
  • The most productive year is 2016, with 8 publications.
  • The least productive years with any output are 1982, 1983, 1984, 1987 and others, with 1 publication each.
  • 9 of the 44 years in the span carry no publications at all (1985, 1986, 1988, 1995 and others).
  • The rate of publication averages 2.1 papers per year over the whole span, or 2.6 per year counting only the 35 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 15 publications, 16% of the career total.
  • Split into equal eras - 1982-1996: 26 publications (1.7 per year); 1997-2011: 27 publications (1.8 per year); 2012-2025: 38 publications (2.7 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

D.K. Combs 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 D.K. Combs 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, 74–78 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: 76 publications — 12th percentile

12% 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
59–63 66
64–68 75
69–73 71
74–78 85 76
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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D.K. Combs publication distribution in Animal Science and Veterinary in 2026 - data summary

  • The chart plots the publication count of all 3,155 Animal Science and Veterinary scientists ranked by Research.com in 2026, grouped into 84 ranges running from 29–33 to 442+ publications.
  • D.K. Combs, a Animal Science and Veterinary scholar from University of Wisconsin–Madison, records 76 publications - the 12th percentile of the discipline.
  • 12% of ranked Animal Science and Veterinary scientists score the same or lower than D.K. Combs, and about 88% score higher.
  • The median of the discipline falls in the 139–143 publications range, and D.K. Combs ranks below the median.
  • The most crowded range is 119–123 publications, holding 109 scientists (3% of the field).
  • 47% of the field sits in the lowest quarter of the value range (up to 129–133 publications), so the distribution leans towards the lower end of the scale.
  • The final bar has no upper bound: it groups every scientist with 442 publications or more, 99 scientists in all (3% of the field).

D.K. Combs 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 D.K. Combs 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, 33 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: 33 D-Index — 39th percentile

39% 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 33
34 126
35 134
36 112
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
Download as CSV

D.K. Combs D-index placement in Animal Science and Veterinary in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 3,155 Animal Science and Veterinary scientists ranked by Research.com in 2026, grouped into 58 ranges running from 20 to 77+ D-Index.
  • D.K. Combs, a Animal Science and Veterinary scholar from University of Wisconsin–Madison, records 33 D-Index - the 39th percentile of the discipline.
  • 39% of ranked Animal Science and Veterinary scientists score the same or lower than D.K. Combs, and about 61% score higher.
  • The median of the discipline falls in the 36 D-Index range, and D.K. Combs ranks below the median.
  • The most crowded range is 31 D-Index, holding 158 scientists (5% of the field).
  • 43% of the field sits in the lowest quarter of the value range (up to 34 D-Index), so the distribution leans towards the lower end of the scale.
  • The final bar has no upper bound: it groups every scientist with 77 D-Index or more, 100 scientists in all (3% of the field).

Overview

D.K. Combs is affiliated with the University of Wisconsin-Madison in the United States and has contributed extensively to the fields of Agricultural and Biological Sciences as well as Biochemistry, Genetics and Molecular Biology. Their research spans multiple subfields, particularly Plant Science, Agronomy and Crop Science, Genetics, Cell Biology, and Animal Science and Zoology.

The scientist's main topics of work include:

  • Ruminant Nutrition and Digestive Physiology
  • Wheat and Barley Genetics and Pathology
  • Bioenergy Crop Production and Management
  • Plant Pathogens and Fungal Diseases
  • Plant Disease Management Techniques
  • Effects of Environmental Stressors on Livestock
  • Genetics and Plant Breeding

D.K. Combs has frequently published in several scientific venues, involving peer-reviewed journals such as Journal of Dairy Science, Frontiers in Plant Science, Theoretical and Applied Genetics, Heliyon, and Grass and Forage Science.

Notable papers authored or coauthored by this scientist include the following:

  • Randomized clinical trial to assess the effect of antibiotic therapy on health and growth of preweaned dairy calves diagnosed with respiratory disease using respiratory scoring and lung ultrasound, 2020, Journal of Dairy Science
  • Genome-Wide Association Studies Identifying Multiple Loci Associated With Alfalfa Forage Quality, 2021, Frontiers in Plant Science
  • Identification of genetic loci associated with five agronomic traits in alfalfa using multi-environment trials, 2023, Theoretical and Applied Genetics
  • Comparison of two in situ reference methods to estimate indigestible NDF by near infrared reflectance spectroscopy in alfalfa, 2021, Heliyon
  • Intensive mechanical processing of forage crops to improve fibre digestion, 2022, Grass and Forage Science

Collaboration plays an important role in D.K. Combs's research, having frequently coauthored works with several researchers including Sen Lin, Cesar Augusto Medina, Glenn E. Shewmaker, Steve Fransen, and Don Llewellyn.

Best Publications

  • High Feed Intake Increases Liver Blood Flow and Metabolism of Progesterone and Estradiol-17β in Dairy Cattle

    S. Sangsritavong;D.K. Combs;R. Sartori;L.E. Armentano

  • In Situ Dry Matter, Protein, and Fiber Degradation of Perennial Forages

    P.C. Hoffman;S.J. Sievert;R.D. Shaver;D.A. Welch

  • Effects of forage particle size and grain fermentability in midlactation cows. II. Ruminal pH and chewing activity.

    K.M. Krause;D.K. Combs;K.A. Beauchemin

  • Effects of Prepartum Diet, Inert Rumen Bulk, and Dietary Polyethylene Glycol on Dry Matter Intake of Lactating Dairy Cows

    T.R. Johnson;D.K. Combs

  • Effects of Forage Particle Size, Forage Source, and Grain Fermentability on Performance and Ruminal pH in Midlactation Cows

    K.M. Krause;D.K. Combs

  • Effects of Forage Particle Size and Grain Fermentability in Midlactation Cows. I. Milk Production and Diet Digestibility

    K.M. Krause;D.K. Combs;K.A. Beauchemin

  • Intake and milk production of cows fed diets that differed in dietary neutral detergent fiber and neutral detergent fiber digestibility

    C. Kendall;C. Leonardi;P.C. Hoffman;D.K. Combs

  • Effects of increasing levels of grain supplementation on rumen environment and lactation performance of dairy cows grazing grass-legume pasture.

    R.B. Reis;D.K. Combs

  • Effects of fat supplementation and immature alfalfa to concentrate ratio on lactation performance of dairy cattle.

    M.J. Jerred;D.J. Carroll;D.K. Combs;R.R. Grummer

  • Long-Term Effects of Acetate and Propionate on Voluntary Feed Intake by Midlactation Cows

    A.C. Sheperd;D.K. Combs

  • Performance of Lactating Dairy Cows Fed Alfalfa Silage or Perennial Ryegrass Silage

    P.C. Hoffman;D.K. Combs;M.D. Casler

  • Effects of Roasting, Extrusion, and Particle Size on the Feeding Value of Soybeans for Dairy Cows

    T.A. Scott;D.K. Combs;R.R. Grummer

  • Determination of Markers in Digesta and Feces by Direct Current Plasma Emission Spectroscopy

    D.K. Combs;L.D. Satter

  • Mineral concentrations in hair as indicators of mineral status: a review.

    Unknown

  • Variability of ovarian structures and plasma progesterone profiles in dairy cows with ovarian cysts.

    D.J. Carroll;R.A. Pierson;E.R. Hauser;R.R. Grummer

  • Effects of fat supplementation and immature alfalfa to concentrate ratio on plasma progesterone, energy balance and reproductive traits of dairy cattle

    D.J. Carroll;M.J. Jerred;R.R. Grummer;D.K. Combs

  • An On‐Farm Test of Perennial Forage Grass Varieties under Management Intensive Grazing

    M. D. Casler;D. J. Undersander;C. Fredericks;D. K. Combs

  • Effects of Increasing Levels of Refined Cornstarch in the Diet of Lactating Dairy Cows on Performance and Ruminal pH

    K.M. Krause;D.K. Combs;K.A. Beauchemin

  • An alternative method to assess 24-h ruminal in vitro neutral detergent fiber digestibility.

    J.P. Goeser;D.K. Combs

  • Effect of forage to concentrate ratio and intake level on utilization of early vegetative alfalfa silage by dairy cows.

    G. Llamas-Lamas;D.K. Combs

  • Effects of Inert Rumen Bulk on Dry Matter Intake in Early and Midlactation Cows Fed Diets Differing in Forage Content

    T.R. Johnson;D.K. Combs

  • Retention of Rare Earths by Hay Particles Following Incubation in Fresh or Autoclaved Rumen Fluid

    D.K. Combs;R.D. Shaver;L.D. Satter

Frequent Co-Authors

P.C. Hoffman
P.C. Hoffman University of Wisconsin–Madison
Randy D. Shaver
Randy D. Shaver University of Wisconsin–Madison
Ric R. Grummer
Ric R. Grummer University of Wisconsin–Madison
Karen A. Beauchemin
Karen A. Beauchemin Agriculture and Agriculture-Food Canada
Xusheng Guo
Xusheng Guo Lanzhou University
Milo C. Wiltbank
Milo C. Wiltbank University of Wisconsin–Madison
Paul M. Fricke
Paul M. Fricke University of Wisconsin–Madison
George E. Shook
George E. Shook University of Wisconsin–Madison
Louis E. Armentano
Louis E. Armentano University of Wisconsin–Madison
Glen A. Broderick
Glen A. Broderick University of Wisconsin–Madison

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