World's Best Scientists 2026 revealed!

D-Index & Metrics

Animal Science and Veterinary

D-Index
55
Citations
13258
World Ranking
439
National Ranking
30

Research.com Recognitions

  • 2018 - 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:

  • Internal medicine
  • Biochemistry
  • Animal science

His primary areas of investigation include Lactation, Dairy cattle, Animal science, Ice calving and Food science. The concepts of his Lactation study are interwoven with issues in Monensin, Dry matter and Confidence interval. His Dairy cattle research incorporates themes from Rumen, Artificial insemination, Credible interval and Acidosis.

His studies in Animal science integrate themes in fields like Internal medicine, Insemination and Endocrinology. Ian J. Lean interconnects Estrous cycle and Pregnancy rate in the investigation of issues within Ice calving. Ian J. Lean combines subjects such as Milk production and Fatty acid with his study of Food science.

His most cited work include:

  • A Body Condition Scoring Chart for Holstein Dairy Cows (1968 citations)
  • Milk fever in dairy cows: A review of pathophysiology and control principles (182 citations)
  • Hypocalcemia in dairy cows: meta-analysis and dietary cation anion difference theory revisited. (174 citations)

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

Ian J. Lean spends much of his time researching Animal science, Dairy cattle, Lactation, Ice calving and Dry matter. His Animal science research includes themes of Rumen, Endocrinology and Internal medicine. His study in Dairy cattle is interdisciplinary in nature, drawing from both Urea, Amino acid, Monensin, Meta-analysis and Milk production.

The Lactation study which covers Vitamin D and neurology that intersects with Vitamin. His work carried out in the field of Ice calving brings together such families of science as Mastitis, Fertility, Urine and Estrous cycle. His Dry matter study also includes

  • Neutral Detergent Fiber most often made with reference to Food science,
  • Silage which connect with Hay.

He most often published in these fields:

  • Animal science (57.85%)
  • Dairy cattle (33.06%)
  • Lactation (29.75%)

What were the highlights of his more recent work (between 2017-2021)?

  • Animal science (57.85%)
  • Lactation (29.75%)
  • Dairy cattle (33.06%)

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

His primary scientific interests are in Animal science, Lactation, Dairy cattle, Beef cattle and Reproduction. His research in the fields of Dry matter overlaps with other disciplines such as Microbiome. His Lactation research is multidisciplinary, incorporating perspectives in Cholecalciferol, Vitamin D and neurology and Insulin.

His Dairy cattle study combines topics in areas such as Herd, Reproductive management and Environmental health. His study on Beef cattle also encompasses disciplines like

  • Pasture which intersects with area such as Glycogen, Animal feed, Silage and Hay,
  • Rest period and related Biceps and NEFA. His work in the fields of Ice calving, such as Metritis, overlaps with other areas such as Retained placenta.

Between 2017 and 2021, his most popular works were:

  • Meta-analysis of the effects of prepartum dietary cation-anion difference on performance and health of dairy cows. (34 citations)
  • Effects of prepartum dietary cation-anion difference intake on production and health of dairy cows: A meta-analysis. (27 citations)
  • Meta-analysis to predict the effects of metabolizable amino acids on dairy cattle performance (16 citations)

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

  • Internal medicine
  • Biochemistry
  • Pathology

His primary areas of study are Animal science, Ice calving, Lactation, Urine and Retained placenta. His Animal science research is mostly focused on the topic Beef cattle. His Urine research is multidisciplinary, relying on both Mastitis, Metritis and Milk yield.

His Meta-analysis study integrates concerns from other disciplines, such as Amino acid, Dairy cattle and Milk protein. The various areas that Ian J. Lean examines in his Artificial insemination study include Rate ratio and Fertility. His Milk fever study combines topics from a wide range of disciplines, such as Breed and Dry matter.

Best Publications

  • A Body Condition Scoring Chart for Holstein Dairy Cows

    A. J. Edmonson;I. J. Lean;L. D. Weaver;Thomas B Farver

  • Milk fever in dairy cows: A review of pathophysiology and control principles

    Peter J. DeGaris;Ian J. Lean

  • Hypocalcemia in dairy cows: meta-analysis and dietary cation anion difference theory revisited.

    I.J. Lean;P.J. DeGaris;D.M. McNeil;E. Block

  • Effect of fat additions to diets of dairy cattle on milk production and components: A meta-analysis and meta-regression

    A.R. Rabiee;K. Breinhild;W. Scott;H.M. Golder

  • Invited review: Use of meta-analysis in animal health and reproduction: methods and applications.

    I.J. Lean;A.R. Rabiee;T.F. Duffield;I.R. Dohoo

  • A meta-analysis of the effects of feeding yeast culture produced by anaerobic fermentation of Saccharomyces cerevisiae on milk production of lactating dairy cows

    G.D. Poppy;A.R. Rabiee;I.J. Lean;W.K. Sanchez

  • Invited review: Recommendations for reporting intervention studies on reproductive performance in dairy cattle: Improving design, analysis, and interpretation of research on reproduction

    Ian J. Lean;Matthew C. Lucy;John P. McNamara;Barry J. Bradford

  • Factors influencing fertility of holstein dairy cows: A multivariate description

    C.T. Westwood;I.J. Lean;J.K. Garvin

  • The definition of acidosis in dairy herds predominantly fed on pasture and concentrates.

    E. Bramley;I.J. Lean;W.J. Fulkerson;M.A. Stevenson

  • Review: Enhancing gastrointestinal health in dairy cows

    J. C. Plaizier;M. Danesh Mesgaran;H. Derakhshani;H. Golder

  • A Meta-Analysis of the Impact of Monensin in Lactating Dairy Cattle. Part 1. Metabolic Effects

    T.F. Duffield;A.R. Rabiee;I.J. Lean

  • A meta-analysis of the impact of monensin in lactating dairy cattle. Part 2. Production effects.

    T.F. Duffield;A.R. Rabiee;I.J. Lean

  • Effects of feeding organic trace minerals on milk production and reproductive performance in lactating dairy cows: a meta-analysis.

    A.R. Rabiee;I.J. Lean;M.A. Stevenson;M.T. Socha

  • The effects of lactation on the fertility of dairy cows

    K L Macmillan;I J Lean;C T Westwood

  • The medicine and epidemiology of bovine respiratory disease in feedlots.

    P. M. V. Cusack;N. McMeniman;I. J. Lean

  • Efficacy of Ovsynch program on reproductive performance in dairy cattle: a meta-analysis.

    A.R. Rabiee;I.J. Lean;M.A. Stevenson

  • A meta-analysis of zilpaterol and ractopamine effects on feedlot performance, carcass traits and shear strength of meat in cattle.

    Ian J. Lean;John M. Thompson;Frank R. Dunshea

  • Milk fatty acids. I. Variation in the concentration of individual fatty acids in bovine milk.

    P.J. Moate;P.J. Moate;W. Chalupa;R.C. Boston;I.J. Lean

  • The effect of internal teat sealant products (Teatseal and Orbeseal) on intramammary infection, clinical mastitis, and somatic cell counts in lactating dairy cows: a meta-analysis.

    A.R. Rabiee;I.J. Lean

  • Meta-analysis of the effects of prepartum dietary cation-anion difference on performance and health of dairy cows.

    J.E.P. Santos;I.J. Lean;H. Golder;E. Block

  • Microbial fermentation of cereal grains in vitro

    Y Opatpatanakit;RC Kellaway;IJ Lean;G Annison

  • A meta-analysis of the impact of monensin in lactating dairy cattle. Part 3. Health and reproduction.

    T.F. Duffield;A.R. Rabiee;I.J. Lean

  • Indications and implications for testing of milk urea in dairy cattle: a quantitative review. Part 2. Effect of dietary protein on reproductive performance.

    C.T. Westwood;I.J. Lean;R.C. Kellaway

  • Relationships between fertility, peak milk yields and lactational persistency in dairy cows

    I.J. Lean;J.C. Galland;J.L. Scott

  • Effects of Monensin on the Metabolism of Periparturient Dairy Cows

    K.A. Stephenson;I.J. Lean;M.L. Hyde;M.A. Curtis

  • Energy and Protein Nutrition Management of Transition Dairy Cows

    Ian J. Lean;Robert Van Saun;Peter J. DeGaris

Frequent Co-Authors

Pietro Celi
Pietro Celi University of Melbourne
Elliot Block
Elliot Block Princeton University
José E. P. Santos
José E. P. Santos University of Florida
Mark Stevenson
Mark Stevenson University of Melbourne
Peter J. Moate
Peter J. Moate University of Melbourne
Christopher S. McSweeney
Christopher S. McSweeney Commonwealth Scientific and Industrial Research Organisation
Todd F. Duffield
Todd F. Duffield University of Guelph
William Chalupa
William Chalupa University of Pennsylvania
Graham E. Gardner
Graham E. Gardner Murdoch University
Frank R. Dunshea
Frank R. Dunshea University of Melbourne

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Related Online Degrees & Career Pathways

Pursuing a degree in Animal Science or Veterinary studies in the USA opens doors to diverse career pathways, many of which can be further enhanced through related online programs. For those interested in the psychological aspects of animal behavior or human-animal interaction, exploring online school psychology programs nasp approved can provide valuable insight and credentials.

Professionals aiming to integrate mental health with veterinary care or animal-assisted therapies might consider advanced training via apa accredited online programs. These programs are designed to help students pursue clinical psychology degrees with flexibility and without GRE requirements.

Additionally, understanding substance abuse issues, both in human and animal populations, can be addressed by programs that allow you to become a drug counselor online. Such knowledge is crucial for holistic veterinary care and community health initiatives.

For those interested in family dynamics impacted by pet ownership or veterinary social work, earning a master’s degree through marriage and family therapy masters programs online offers flexible options to gain relevant skills and credentials.

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