Grant Dewell

Education & Certifications  

DVM, Colorado State University, 1993
MS, Agriculture Economics, Colorado State University, 1998
PhD, Clinical Sciences-Epidemiology, Colorado State University, 2008


Courses as Primary Instructor
VDPAM 436D - Beef Records Analysis: Feedlot Production Medicine
VDPAM 463 - Feedlot Production Medicine

Courses as Guest Lecture
VDPAM 309 - Introduction to Production Animal Informatics
VDPAM 463A - Beef Records Analysis
VDPAM 465 - Animal Welfare Clinical Rotation
VDPAM 481 - Advanced Cow/Calf Production Medicine
VDPAM 483 - Beef Production Medicine
VDPAM 487 - Livestock Disease Prevention

Research Focus & Interests  

Research program is targeted at applied beef cattle production medicine. Interested in pre-harvest food safety, infectious reproductive diseases, bovine respiratory disease and animal welfare and handling.

Honors & Awards  

Iowa State University Extension and Outreach Award for Excellence in Research-Based Programming


Academy of Veterinary Consultants
American Association of Bovine Practitioners
American Veterinary Medical Association
Iowa Veterinary Medical Association
National Cattlemen's Beef Association
Iowa Cattlemen's Association

Selected Publications  

Google Scholar Page

Dewell RD, Millman ST, Parsons RL, Sadler LJ, Noffsinger TH, Busby WD, Wang C, and Dewell GA. Clinical trial to assess the impact of acclimation and low-stress cattle handling on bovine respiratory disease and performance during the feedyard finishing phase. The Bovine Practitioner. Spring 2019. Pgs 71-80.

Dewell RD, Dewell GA, Euken RM, Sadler LJ, Wang C, Carmichael BA. 2018. Association of floor type on health parameters of cattle fed indoors during the finishing phase. The Bovine Practitioner 52(1):16-25.

Dewell RD, Dewell GA, Bear DA, Weber W, Griffin DD, Rowe EW. 2016. Description and justification of a consistent technique for euthanasia of bovines using firearm and penetrating captive bolt. The Bovine Practitioner 50(2):190-195

Dewell GA, Phillips PE, Dohlman TA, Harmon KL, Gauger PC. 2016. Validation of a new sampling methodology to detect Tritrichomonas foetus by real-time polymerase chain reaction. Journal of Veterinary Diagnostic Investigation 28(5):595-598

Derscheid RJ,  Dewell RD, Dewell GA, Kleinhenz K, Shearer L, Gilliam J, Reynolds J, Sun Y, Shearer JK. 2016. Validation of a Portable Pneumatic Captive-Bolt Device as a Single-Step Method of Euthanasia for Use in Mass Depopulation of Feedlot CattleJournal of the American Veterinary Medical Association 248(1):96-104.

Dewell RD, Moran LE, Kleinhenz KE, Derscheid RJ, Dewell GA, Shearer LC, Shearer JK. 2015. Assessment and comparison of electrocardiographic and clinical cardiac evidence of death following use of a penetrating captive bolt in bovines. The Bovine Practitioner 49(1):32-36.

Hanthorn CJ, Dewell GA, Dewell RD, Cooper VL, Wang C, Plummer PJ, Lakritz J. 2014. Serum concentrations of haptoglobin and haptoglobin-matrix metalloproteinase 9 (Hp-MMP 9) complexes of bovine calves in a bacterial respiratory challenge model. BMC Veterinary Research 10:285.

Hanthorn CJ, Dewell RD, Cooper VL, Frana TS, Plummer PJ, Wang C, Dewell GA. 2014. Randomized clinical trial to evaluate the pathogenicity of Biberstenia trehalosi in respiratory disease among calves. BMC Veterinary Research 10:89

Cho YI, Sun D, Cooper V, Dewell G, Schwartz K, Yoon KJ. 2012. Evaluation of a commercial rapid test kit for detecting bovine enteric pathogens in feces. Journal Veterinary Diagnostic Investigation 24(3):559-562.

Morley, PS, DA Dargatz, DR Hyatt, GA Dewell, JG Patterson, BA Burgess and TE Wittum. 2011. Effects of restricted antimicrobial exposure on antimicrobial resistance in fecal Escherichia coli from feedlot cattle. Foodborne Pathogens and Disease 8(1):87-98.