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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 29 2533 2305 710 588 73 5098

Richard A. Kohn publications per year

The chart shows the history of publications by Richard A. Kohn between 1987 and 2019, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Richard A. Kohn published across 33 years, from 1987 to 2019, averaging 2.7 papers a year. Output peaked at 22 publications in 2015. 2 of the 88 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1987 to 2019. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2015. 1987: 1 publication 1988: 1 publication 1989: 0 publications 1990: 0 publications 1991: 0 publications 1992: 1 publication 1993: 1 publication 1994: 0 publications 1995: 4 publications 1996: 2 publications 1997: 1 publication 1998: 5 publications 1999: 2 publications 2000: 6 publications 2001: 1 publication 2002: 5 publications 2003: 4 publications 2004: 3 publications 2005: 3 publications 2006: 2 publications 2007: 6 publications 2008: 3 publications 2009: 1 publication 2010: 4 publications 2011: 1 publication 2012: 1 publication 2013: 1 publication 2014: 1 publication 2015: 22 publications 2016: 3 publications 2017: 1 publication 2018: 1 publication 2019: 1 publication
1987 2019

88 publications in total across all disciplines

View publications per year as a table
Richard A. Kohn: publications per year, 1987 to 2019
Year Publications
1987 1
1988 1
1989 0
1990 0
1991 0
1992 1
1993 1
1994 0
1995 4
1996 2
1997 1
1998 5
1999 2
2000 6
2001 1
2002 5
2003 4
2004 3
2005 3
2006 2
2007 6
2008 3
2009 1
2010 4
2011 1
2012 1
2013 1
2014 1
2015 22
2016 3
2017 1
2018 1
2019 1
Total 88
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Richard A. Kohn publications per year - data summary

  • Richard A. Kohn, a Animal Science and Veterinary scholar from University of Maryland, College Park, has 88 publications recorded across 33 years, from 1987 to 2019.
  • The oldest publication on record dates to 1987 and the most recent to 2019.
  • The most productive year is 2015, with 22 publications.
  • The least productive years with any output are 1987, 1988, 1992, 1993 and others, with 1 publication each.
  • 4 of the 33 years in the span carry no publications at all (1989, 1990, 1991 and 1994).
  • The rate of publication averages 2.7 papers per year over the whole span, or 3.0 per year counting only the 29 years with at least one publication.
  • The last 5 years on the chart (2015-2019) hold 28 publications, 32% of the career total.
  • Split into equal eras - 1987-1997: 11 publications (1.0 per year); 1998-2008: 40 publications (3.6 per year); 2009-2019: 37 publications (3.4 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Richard A. Kohn 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 Richard A. Kohn 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, 69–73 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: 73 publications — 10th percentile

10% 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 73
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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Richard A. Kohn 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.
  • Richard A. Kohn, a Animal Science and Veterinary scholar from University of Maryland, College Park, records 73 publications - the 10th percentile of the discipline.
  • 10% of ranked Animal Science and Veterinary scientists score the same or lower than Richard A. Kohn, and about 90% score higher.
  • The median of the discipline falls in the 139–143 publications range, and Richard A. Kohn 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).

Richard A. Kohn 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 Richard A. Kohn 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, 29 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: 29 D-Index — 20th percentile

20% 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 29
30 154
31 158
32 143
33 137
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

Richard A. Kohn 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.
  • Richard A. Kohn, a Animal Science and Veterinary scholar from University of Maryland, College Park, records 29 D-Index - the 20th percentile of the discipline.
  • 20% of ranked Animal Science and Veterinary scientists score the same or lower than Richard A. Kohn, and about 80% score higher.
  • The median of the discipline falls in the 36 D-Index range, and Richard A. Kohn 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

What is he best known for?

The fields of study he is best known for:

  • Biochemistry
  • Enzyme
  • Organic chemistry

Richard A. Kohn mainly focuses on Animal science, Urea, Dairy cattle, Nitrogen and Excretion. His Animal science study combines topics from a wide range of disciplines, such as Biotechnology and Inorganic phosphorus. Richard A. Kohn integrates many fields in his works, including Urea and Urea nitrogen.

Richard A. Kohn has researched Dairy cattle in several fields, including Herd, Herd management and Forage. The concepts of his Nitrogen study are interwoven with issues in Clearance rate and Gram. His Excretion research includes themes of Feed conversion ratio and Nitrogen balance.

His most cited work include:

  • Using Milk Urea Nitrogen to Predict Nitrogen Excretion and Utilization Efficiency in Lactating Dairy Cows (341 citations)
  • A nitrogen footprint model to help consumers understand their role in nitrogen losses to the environment (246 citations)
  • Using blood urea nitrogen to predict nitrogen excretion and efficiency of nitrogen utilization in cattle, sheep, goats, horses, pigs, and rats (245 citations)

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

His primary areas of study are Animal science, Rumen, Dairy cattle, Food science and Herd. The Animal science study combines topics in areas such as Urea, Dairy industry, Excretion and Nitrogen. His Rumen research is multidisciplinary, incorporating perspectives in Chromatography and Metabolism.

Richard A. Kohn has included themes like Endocrinology and Milk production in his Dairy cattle study. His Food science research includes elements of Dry matter and Cattle feeding. His Herd study which covers Manure that intersects with Crop, Animal product and Dietary Formulations.

He most often published in these fields:

  • Animal science (38.18%)
  • Rumen (30.91%)
  • Dairy cattle (29.09%)

What were the highlights of his more recent work (between 2011-2019)?

  • Fermentation (14.55%)
  • Rumen (30.91%)
  • Microorganism (7.27%)

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

Fermentation, Rumen, Microorganism, Food science and Fatty acid are his primary areas of study. His studies deal with areas such as Environmental chemistry and Acetogenesis, Methanogenesis as well as Rumen. His Microorganism research is multidisciplinary, relying on both Biomass, Biotechnology and Biochemistry.

Richard A. Kohn interconnects Hydrogen supply, Propionate, Animal science and Volatile fatty acids in the investigation of issues within Fatty acid. His Propionate research is multidisciplinary, incorporating elements of In vitro, Butyrate, Chromatography, Digestion and Forage. His research integrates issues of Sodium acetate and Nutrient in his study of Animal science.

Between 2011 and 2019, his most popular works were:

  • A nitrogen footprint model to help consumers understand their role in nitrogen losses to the environment (246 citations)
  • Impacts of ruminal microorganisms on the production of fuels: how can we intercede from the outside? (12 citations)
  • Representing interconversions among volatile fatty acids in the Molly cow model (6 citations)

Best Publications

  • Using Milk Urea Nitrogen to Predict Nitrogen Excretion and Utilization Efficiency in Lactating Dairy Cows

    J.S. Jonker;R.A. Kohn;R.A. Erdman

  • Using blood urea nitrogen to predict nitrogen excretion and efficiency of nitrogen utilization in cattle, sheep, goats, horses, pigs, and rats

    R. A. Kohn;M. M. Dinneen;E. Russek-Cohen

  • Effects of Amount and Source of Fat on the Rates of Lipolysis and Biohydrogenation of Fatty Acids in Ruminal Contents

    T.M. Beam;T.C. Jenkins;P.J. Moate;R.A. Kohn

  • Milk urea nitrogen target concentrations for lactating dairy cows fed according to National Research Council recommendations.

    J.S. Jonker;R.A. Kohn;R.A. Erdman

  • Evaluation of models to estimate urinary nitrogen and expected milk urea nitrogen.

    R.A. Kohn;K.F. Kalscheur;E. Russek-Cohen

  • Dairy Herd Management Practices that Impact Nitrogen Utilization Efficiency

    J.S. Jonker;R.A. Kohn;J. High

  • A Sensitivity Analysis of Nitrogen Losses from Dairy Farms

    R.A. Kohn;Z. Dou;J.D. Ferguson;R.C. Boston

  • Phosphorus characteristics of dairy feces affected by diets.

    Zhengxia Dou;Katharine F. Knowlton;Richard A. Kohn;Zhiguo Wu

  • Effects of Dietary Crude Protein Concentration and Degradability on Milk Production Responses of Early, Mid, and Late Lactation Dairy Cows

    K.F. Kalscheur;J.H. Vandersall;R.A. Erdman;R.A. Kohn

  • Milk production of dairy cows fed differing concentrations of rumen-degraded protein.

    K.F. Kalscheur;K.F. Kalscheur;R.L. Baldwin;B.P. Glenn;R.A. Kohn

  • Calculation of the buffering capacity of bicarbonate in the rumen and in vitro.

    R A Kohn;T F Dunlap

  • Use of milk urea nitrogen to improve dairy cow diets.

    J.S. Jonker;R.A. Kohn;J. High

  • A meta-analysis of fumarate effects on methane production in ruminal batch cultures

    E. M. Ungerfeld;R. A. Kohn;R. J. Wallace;C. J. Newbold

  • EFFECTS OF MILK UREA NITROGEN AND OTHER FACTORS ON PROBABILITY OF CONCEPTION OF DAIRY COWS

    K. Guo;E. Russek-Cohen;M. A.Varner;R.A. Kohn

  • Whole-farm nitrogen balance on western dairy farms.

    R. A. Spears;R. A. Kohn;Allen J. Young

  • Enrichment of proteolytic activity relative to nitrogen in preparations from the rumen for in vitro studies

    R.A. Kohn;M.S. Allen

  • Phosphorus Feeding Levels and Critical Control Points on Dairy Farms

    Z. Dou;J.D. Ferguson;J. Fiorini;J.D. Toth

  • Whole-Farm Phosphorus Balance on Western Dairy Farms

    R.A. Spears;A.J. Young;R.A. Kohn

  • The role of thermodynamics in controlling rumen metabolism.

    R. A. Kohn;R. C. Boston;J. P. McNamara

  • Managing Nitrogen on Dairy Farms: An Integrated Approach I. Model Description

    Z. Dou;R.A. Kohn;J.D. Ferguson;R.C. Boston

  • Evaluation of Models for Balancing the Protein Requirements of Dairy Cows

    R.A. Kohn;K.F. Kalscheur;M. Hanigan

  • Salvage of blood urea nitrogen in sheep is highly dependent on plasma urea concentration and the efficiency of capture within the digestive tract.

    Nishanth E Sunny;Sandra L Owens;R L Baldwin;Samer W El-Kadi

  • In vitro protein degradation of feeds using concentrated enzymes extracted from rumen contents

    R.A. Kohn;M.S. Allen

  • Storage of fresh and ensiled forages by freezing affects fibre and crude protein fractions

    Richard A Kohn;Michael S Allen

  • Comparison of analytical methods and the influence of milk components on milk urea nitrogen recovery.

    A.B. Peterson;K.R. French;E. Russek-Cohen;R.A. Kohn

  • The Impact of Somatotropin, Milking Frequency, and Photoperiod on Dairy Farm Nutrient Flows

    T.F. Dunlap;R.A. Kohn;G.E. Dahl;M. Varner

  • The impact of animal production systems on the nitrogen cycle

    James Galloway;Frank Dentener;Marshall Burke;Egon Dumont

  • Impacts of ruminal microorganisms on the production of fuels: how can we intercede from the outside?

    Paul J. Weimer;Paul J. Weimer;Richard A. Kohn

  • A Comparison of Instruments and Laboratories Used to Measure Milk Urea Nitrogen in Bulk-Tank Milk Samples*

    R.A. Kohn;K.R. French;E. Russek-Cohen

Frequent Co-Authors

James D. Ferguson
James D. Ferguson University of Pennsylvania
Richard A. Erdman
Richard A. Erdman University of Maryland, College Park
Zhengxia Dou
Zhengxia Dou University of Pennsylvania
Kenneth Kalscheur
Kenneth Kalscheur Agricultural Research Service
Michael S. Allen
Michael S. Allen Michigan State University
Raymond C. Boston
Raymond C. Boston St Vincent's Hospital
James N. Galloway
James N. Galloway University of Virginia
Paul J. Weimer
Paul J. Weimer University of Wisconsin–Madison
T.C. Jenkins
T.C. Jenkins Clemson University

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