DVM 1990, University of Minnesota
PhD 1995, Kansas State University
Research and Teaching
Dr. Dritz conducts on-farm research to improve swine production and feeding management practices. In addition, Dr. Dritz is an active member of the K-State Applied Swine Nutrition Team. Areas of investigation include oral and dietary vitamin D supplementation, utilization of alternative feed ingredients in growing pig diets, PCV2 vaccines under field conditions, feed based antimicrobials and additives, and the impact of weaning age on subsequent growth performance and most recently investigations into the role of feed in Porcine Epidemic Diarrhea virus (PEDv) transmission. These areas all carry a common theme in that they involve field-based research to solve current problems facing swine producers. They leverage his unique talents of understanding modern swine production systems, the ability to use sophisticated experimental designs and analysis in field settings, and his passion for focusing on areas that will make an impact. Dr. Dritz also teaches a foundation level data management course (DMP 830) focused on a variety of population-based disciplines in veterinary medicine and animal production and mentors MS and PhD candidates.
Shelton, N. W., S. S. Dritz, J. L. Nelssen, M. D. Tokach, R. D. Goodband, J. M. DeRouchey, H. Yang, D. A. Hill, D. Holzgraefe, D. H. Hall, and D. C. Mahan. 2014. Effects of dietary vitamin E concentration and source on sow, milk, and pig concentrations of α-tocopherol. J. Anim. Sci. 92.
Flohr, J.R. M.D. Tokach, S.S. Dritz, J.M. DeRouchey, R.D. Goodband, J.L. Nelssen, and J.R. Bergstrom. 2014. An evaluation of the effects of added vitamin D3 in maternal diets on sow and pig performance. J. Anim. Sci. 92:594-603.
Flohr, J. R., M. D. Tokach, S. S. Dritz, J. M. DeRouchey, R. D. Goodband, J. L. Nelssen, S. C. Henry, L. M. Tokach, M. L. Potter, J. P. Goff, N. J. Koszewski, R. L. Horst, E. L. Hansen, and E. D. Fruge. 2014. Effects of supplemental vitamin D3 on serum 25(OH)D3 and growth of preweaning and nursery pigs. J. Anim. Sci. 92:152-163.
Goodband R. D., M. D. Tokach, M. A. D. Goncalves, J. C. Woodworth, S. S.Dritz, and J. M. DeRouchey 2013 Nutritional enhancement during pregnancy and its effects on reproduction in swine. Anim. Animal Frontiers 3:68-75
Potter. M. L., E. M. Kane, J. R. Bergstrom, S. S. Dritz, M. D. Tokach, J. M. DeRouchey, R. D. Goodband, and J. L. Nelssen. 2012. Effects of diet source and vaccination for porcine circovirus type 2 and Mycoplasma hyopneumoniae on nursery pig performance. J. Anim. Sci. 90:4063-4071.
Potter, M. L., L. M. Tokach, S. S. Dritz, S. C. Henry, J. M. DeRouchey, M. D. Tokach, R. D. Goodband, J. L. Nelssen, R. R. R. Rowland, R. A. Hesse, and R. Oberst. 2012. Genetic line influences pig growth rate responses to vaccination for porcine circovirus type 2. J Swine Health Prod. 20:34–43.
Shelton, N. W., M. D. Tokach, S. S. Dritz, R. D. Goodband, J. L. Nelssen, J. M. DeRouchey, and J. L. Usry. 2012. Effects of porcine circovirus type 2 vaccine and increasing standardized ileal digestible lysine:ME ratio on growth performance and carcass composition of growing and finishing pigs. J Anim Sci. 90: 361-372.
Jacela, J. Y., S. S. Dritz, J. M. DeRouchey, M. D. Tokach, R. D. Goodband, and J. L. Nelssen, 2011. Field evaluation of a PCV2 vaccine on finishing pig growth performance and mortality rate in a herd with a history of porcine circovirus disease. J Swine Health Prod. 19:10-18.
Horlen, K.P., S.S. Dritz, J.C. Nietfeld, S.C. Henry, R.A. Hesse, and R.R.R. Rowland. 2008. A Field evaluation of pig mortality and growth performance following commercial vaccination against porcine circovirus type 2. JAVMA. 232:906-912.
Main, R. G., S. S. Dritz, M. D. Tokach, R. D. Goodband, K. C. Dhuyvetter and J. L. Nelssen. 2005. A partial-budgeting tool to describe the effect of lactation space and lactation-space management on net revenue in a multi-site production system. J. Swine Health Prod. 13:322-332.
Main, R. G., S. S. Dritz, M. D. Tokach, R. D. Goodband,and J. L. Nelssen. 2004. Increasing weaning age improves pig performance in a multi-site production system. J. Anim. Sci. 82:1499-1507.
Dritz, S. S., M. D. Tokach, R. D. Goodband, and J. L. Nelssen. 2002. Effects of administration of antimicrobials in feed on growth rate and feed efficiency of pigs in multisite production systems. J. A. V. M. A. 220:1690-1695.
K-State Applied Nutrition Team Web Site: www.ksuswine.org