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Kansas State University



Steve Dritz




Steve Dritz
DVM 1990, University of Minnesota
PhD 1995, Kansas State University
Swine Specialist
Phone: (785)532-4202






I conduct on-farm research to improve swine production and feeding management practices. My most recent research projects have quantified the effects of feed antimicrobials in multi-site pig production systems, examined alternatives to the use of conventional antimicrobials, and developed alternative antimicrobial delivery systems in the nursery phase. An additional research focus has been to evaluate the impact of pig weaning age from a biologic and economic perspective in multi-site pig production. My focus also is on developing practical spreadsheet based tools to aid economic evaluation swine production management changes. I have co-authored two book chapters related to the nutrition of early weaned pigs and numerous scientific articles on swine nutrition and production. Additionally, I provide nutritional advice to a variety of North American swine farms and frequently provides international technical training seminars.

Selected Publications  

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. 2011. 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.

Sulabo, R. C., C. K. Jones, M. D. Tokach, R. D. Goodband, S. S. Dritz, D. R. Campbell, B. W. Ratliff, J. M. DeRouchey, and J. L. Nelssen. 2011. Factors affecting storage stability of various commercial phytase sources. J. Anim. Sci. 89:4262-4271.

Shelton, N. W., M. D. Tokach, S. S. Dritz, R. D. Goodband, J. L. Nelssen, and J. M. DeRouchey.  2011. Effects of increasing dietary standardized ileal digestible lysine for gilts grown in a commercial finishing environment.  J.  Anim  Sci. 89:3587-3595.

Gottlob, R. O., S. S. Dritz, M. D. Tokach, J. M. DeRouchey, R. D. Goodband, J. L. Nelssen, C. W. Hastad, C. N. Groesbeck, and C. R. Neill. 2007. Effects of water-based antimicrobials on growth performance of weanling pigs. J. Swine Health Prod. 15:198-205.

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.