World's Best Scientists 2026 revealed!

D-Index & Metrics

Animal Science and Veterinary

D-Index
26
Citations
3665
World Ranking
2858
National Ranking
809

Research.com Recognitions

  • 2014 - ASAS Fellow: Extension Category, American Society of Animal Science
  • 2003 - Extension Award, American Society of Animal Science

Overview

James W. Oltjen is affiliated with the University of California, Davis, in the United States. Their research primarily falls within the domain of Agricultural and Biological Sciences, with a particular focus on Animal Science and Zoology, Agronomy and Crop Science, Genetics, Ecology, and Food Science.

Their work extensively covers topics related to ruminant nutrition and digestive physiology, genetic and phenotypic traits in livestock, agriculture sustainability and environmental impact, effects of environmental stressors on livestock, meat and animal product quality, animal nutrition and physiology, and animal behavior and welfare studies.

Frequent publication venues for this scientist include:

  • Journal of Animal Science
  • Translational Animal Science
  • Animal - science proceedings
  • BMC Microbiology
  • Foods

Recent papers authored or co-authored by James W. Oltjen include:

  • "Grass-fed vs. grain-fed beef systems: performance, economic, and environmental trade-offs" (2021), published in Journal of Animal Science
  • "Effects of Multiple Grass- and Grain-Fed Production Systems on Beef Fatty Acid Contents and Their Consumer Health Implications" (2022), published in ACS Food Science & Technology
  • "Effects of dietary energy density and supplemental rumen undegradable protein on intake, viscera, and carcass composition of lambs recovering from nutritional restriction" (2022), published in Journal of Animal Science
  • "Evaluating the Shelf Life and Sensory Properties of Beef Steaks from Cattle Raised on Different Grass Feeding Systems in the Western United States" (2022), published in Foods
  • "Effects of feeding level on efficiency of high- and low-residual feed intake beef steers" (2020), published in Journal of Animal Science

Frequent co-authors collaborating with Oltjen include:

  • Sarah C Klopatek
  • James Dougherty
  • Mark Evered
  • V. H. Oddy
  • Meredith A Harrison

James W. Oltjen has been recognized with awards such as the Extension Award from the American Society of Animal Science in 2003 and was named an ASAS Fellow in the Extension Category in 2014.

Best Publications

  • Carcass Composition in Mature Hereford Cows: Estimation and Effect on Daily Metabolizable Energy Requirement During Winter

    J. J. Wagner;K. S. Lusby;J. W. Oltjen;J. Rakestraw

  • Compensatory growth and carcass quality in growth-restricted and refed beef steers.

    R D Sainz;F De la Torre;J W Oltjen

  • Relationship among weight change, body condition and reproductive performance of range beef cows.

    G. E. Selk;R. P. Wettemann;K. S. Lusby;J. W. Oltjen

  • Role of ruminant livestock in sustainable agricultural systems.

    J W Oltjen;J L Beckett

  • Development of a Dynamic Model of Beef Cattle Growth and Composition

    J. W. Oltjen;A. C. Bywater;R. L. Baldwin;W. N. Garrett

  • Carbon footprint and ammonia emissions of California beef production systems

    K. R. Stackhouse-Lawson;C. A. Rotz;J. W. Oltjen;F. M. Mitloehner

  • Dairy cow culling strategies: making economical culling decisions.

    Terry W. Lehenbauer;James W. Oltjen

  • Performance, residual feed intake, digestibility, carcass traits, and profitability of Angus-Hereford steers housed in individual or group pens.

    G. D. Cruz;J. A. Rodríguez-Sánchez;J. W. Oltjen;R. D. Sainz

  • Estimation of the water requirement for beef production in the United States

    J. L. Beckett;J. W. Oltjen

  • Evaluation of ultrasound for prediction of carcass fat thickness and longissimus muscle area in feedlot steers.

    M. T. Smith;J. W. Oltjen;H. G. Dolezal;D. R. Gill

  • Dry Matter Intake by Feedlot Beef Steers: Influence of Initial Weight, Time on Feed, and Season of Year Received in Yard

    R. B. Hicks;F. N. Owens;D. R. Gill;J. W. Oltjen

  • Animal agriculture and global food supply.

    James W. Oltjen

  • Effects of age on body condition and production parameters of multiparous beef cows.

    B. J. Renquist;J. W. Oltjen;R. D. Sainz;C. C. Calvert

  • ASAS centennial paper: net energy systems for beef cattle--concepts, application, and future models.

    Calvin Ferrell;J. W. Oltjen

  • Daily Dry Matter Intake By Feedlot Cattle: Influence of Breed and Gender

    R. B. Hicks;F. N. Owens;D. R. Gill;J. W. Oltjen

  • Energy and protein metabolism and nutrition in sustainable animal production

    James W. Oltjen;Ermias Kebreab;Hélène Lapierre

  • Growth-promoting Technologies Decrease the Carbon Footprint, Ammonia Emissions, and Costs of California Beef Production Systems

    K. R. Stackhouse;C. A. Rotz;J. W. Oltjen;F. M. Mitloehner

  • Grass-fed vs. grain-fed beef systems: performance, economic, and environmental trade-offs

    Unknown

  • Evaluation of a Model of Beef Cattle Growth and Composition

    J. W. Oltjen;A. C. Bywater;R. L. Baldwin

  • Growth of Holstein calves from birth to 90 days: the influence of dietary zinc and BLAD status.

    J. L. Arrayet;A. M. Oberbauer;T. R. Famula;I. Garnett

  • Meta-analysis of factors affecting carcass characteristics of feedlot steers.

    M. J. McPhee;J. W. Oltjen;T. R. Famula;R. D. Sainz

Frequent Co-Authors

Roberto Daniel Sainz
Roberto Daniel Sainz University of California, Davis
Ermias Kebreab
Ermias Kebreab University of California, Davis
Frank M. Mitloehner
Frank M. Mitloehner University of California, Davis
Fredric N. Owens
Fredric N. Owens Oklahoma State University
W. N. Garrett
W. N. Garrett University of California, Davis
Dante Pazzanese Duarte Lanna
Dante Pazzanese Duarte Lanna Universidade de São Paulo
A. Bannink
A. Bannink Wageningen University & Research
Roger Hegarty
Roger Hegarty AgResearch
R. P. Wettemann
R. P. Wettemann Oklahoma State University
Antonello Cannas
Antonello Cannas University of Sassari

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