Garrett Oetzel, DVM, MS

Department of Medical Sciences
Office: 2054

Garrett Oetzel, DVM, MS

Titles and Education

  1. Current - Professor in the Food Animal Production Medicine Section 
    University of Wisconsin Madison School of Veterinary Medicine, Madison, WI
  2. BS, 1978
    The Ohio State University, Columbus, OH
  3. DVM, 1981
    The Ohio State University, Columbus, OH
  4. MS, 1985
    University of Illinois, Urbana, IL


Dr. Oetzel’s current research interests are in the prevention of hypocalcemia in dairy cattle by oral administration of calcium supplements; the effects of subclinical ketosis on dairy cow performance; and the effects of hypocalcemia on dairy cow health and reproductive performance.  Previous interests of his included the prevention of ruminal acidosis, direct-fed microbials, and manipulating dietary cation-anion different for the prevention of hypocalcemia.

Visit the FAPM Website



Dr. Oetzel teaches veterinary clinical nutrition to the first-year veterinary medical students, food animal medicine to the third-year students, and applied aspects of dairy nutrition and transition cow management to the fourth-year veterinary medical students.  His clinical activities include providing on-farm troubleshooting for dairy herds in Wisconsin and nearby states.

Clinical Interests

Dr. Oetzel’s predominant clinical activity is dairy herd troubleshooting for production and metabolic disease problems. This typically involves a visit to the farm with students, followed by a report and follow-up discussion. Herd problems that he investigates include low milk yield, milk fever, ketosis, diarrhea, displaced abomasum, pneumonia, or general issues with poor fresh cow health. As part of these investigations, he conducts a detailed analysis of feeding practices, evaluate on-farm diagnosis and treatment protocols, and collect samples from the cows for additional testing as needed.

Graduate Training

BS - The Ohio State University (Animal Science), 1978
DVM - The Ohio State University, 1981
Internship and Residency (Food Animal Medicine and Surgery), University of Illinois, 1981 - 1985
MS - University of Illinois (Veterinary Clinical Medicine), 1985

Recent Publications

  1. Vagnoni DB, Davidson M, Rubio L, Oetzel GR, Comets E. Effects of Postpartum Supplemental Oral Ca for Dairy Cows Fed Prepartum Dietary Acidogenic Salts. Animals (Basel). 2021;11(11):3131. Published 2021 Nov 2. doi:10.3390/ani11113131
  2. Pralle RS, Amdall JD, Fourdraine RH, Oetzel GR, White HM. Hyperketonemia Predictions Provide an On-Farm Management Tool with Epidemiological Insights. Animals (Basel). 2021;11(5):1291. Published 2021 Apr 30. doi:10.3390/ani11051291
  3. Fukumori R, Taguchi T, Oetzel GR, Oikawa S. Performance evaluation of a newly designed on-farm blood testing system for determining blood non-esterified fatty acid and β-hydroxybutyrate concentrations in dairy cows. Res Vet Sci. 2021;135:247-252. doi:10.1016/j.rvsc.2020.09.011
  4. Oetzel GR. Undertaking nutritional diagnostic investigations. Vet Clin North Am Food Anim Pract. 2014;30(3):765-788. doi:10.1016/j.cvfa.2014.08.002
  5. McArt JAA, Nydam DV, Oetzel GR. Epidemiology of subclinical ketosis in early lactation dairy cattle. J Dairy Sci. 2012;95(9):5056-5066. doi:10.3168/jds.2012-5443
  6. McArt JA, Nydam DV, Oetzel GR. Dry period and parturient predictors of early lactation hyperketonemia in dairy cattle. J Dairy Sci. 2013;96(1):198-209. doi:10.3168/jds.2012-5681
  7. McArt JA, Nydam DV, Oetzel GR. A field trial on the effect of propylene glycol on displaced abomasum, removal from herd, and reproduction in fresh cows diagnosed with subclinical ketosis. J Dairy Sci. 2012;95(5):2505-2512. doi:10.3168/jds.2011-4908
  8. Oetzel GR, Miller BE. Effect of oral calcium bolus supplementation on early-lactation health and milk yield in commercial dairy herds. J Dairy Sci. 2012;95(12):7051-7065. doi:10.3168/jds.2012-5510