California Agriculture
California Agriculture
California Agriculture
University of California
California Agriculture

James W. Oltjen

Photo of James W Oltjen
CE Specialist
Animal Science
Department of Animal Science
2153 Meyer Hall
Davis, CA 95616
(530) 752-5650 Create VCard


James W. Oltjen is University of California Cooperative Extension Animal Management Systems Specialist.  Jim was raised on a mixed crop-livestock farm in Kansas.  He received his B.S. and M.S. degrees from Kansas State University and the Ph.D. from the University of California, Davis, in 1983.  He was a faculty member in the Animal Science Department at Oklahoma State University from 1983-1990 before joining UC in 1990.  Dr. Oltjen’s efforts are mostly in animal enterprise management, natural resource and beef cattle modeling, and livestock quality assurance programs.  His current research projects include feedlot performance prediction to improve efficiency and reduce variation in beef production, improved grazing and supplementation strategies for beef cow herds, herd management modeling, and cost/benefit of animal identification.  He continues to work with New Zealand, Brazilian, French, and Australian researchers to improve growth and composition models for sheep and beef cattle, and Spanish workers on animal identification.  Within California he is technical advisor to the California Beef Cattle Improvement Association. With the California Cattlemen's Association and the California Beef Council, he developed and implemented a successful Quality Assurance Program to ensure beef safety by working with the state’s cow-calf producers and feedlots;  advanced curriculums in animal health, genetics, residue avoidance, HAACP, and reproduction have been developed.  He is a past-president of the Western Section American Society of Animal Science and received their Extension Award in 1997.  He has served as chair of the ASAS Publications Committte, and was chair or cochair of the Annual Meeting of the American Society of Animal Science in 2005-2007.  He received the ASAS Extension Award in 2003.  Jim was recently on the ASAS Strategic Planning Committee, and was President in 2010.


Ph.D. Nutrition, University of California, Davis. 1983
M.S. Animal Science, Kansas State University. 1978
B.S. Physics, Kansas State University. 1975


Computer decision support software; beef quality assurance; standardized performance analysis for cattle and sheep ranches. Animal management systems; resource use in animal agriculture; beef cattle growth.

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