Picture of  Gregory Penner

Gregory Penner Associate Professor

U of S Centennial Enhancement Chair in Ruminant Nutritional Physiology

6D18 - Agriculture Building

Research Area(s)

  • Ruminant nutritional physiology
  • Cattle nutrition to enhance health and productivity
  • Gut function

Brief Biography

Dr. Greg Penner is an Associate Professor and Centennial Enhancement Chair in Nutritional Physiology. He joined the Department of Animal and Poultry Science at the University of Saskatchewan in 2009 after obtaining his BSA (2004) and M.Sc. (2004) degrees from the same University, and his PhD from the University of Alberta (2009). His research covers forage utilization, ruminant nutrition, and regulation gut function in cattle. He has developed 2 indwelling pH measurement systems that have been adopted by the research community worldwide. Dr. Penner has a well-funded research program supporting and has trained more than 10 graduate students and postdoctoral fellows. He has published over 60 peer-reviewed papers and provided over 40 invited presentations. Greg also has an active extension program helping to communicate research results to end users and  serves as the co-chair for the Saskatchewan Beef and Forage Symposium.


Animal and Poultry Science

Research Interests

My research program focuses on the development of nutritional strategies to enhance the health and productivity of cattle. This includes fundamental research investigating gut function with an emphasis on regulatory processes involved in adaptive and recovery responses. Research techniques used within this theme include the use of Ussing chambers as an ex vivo approach and the temporarily isolated reticulo-rumen technique as an in vivo approach. Results from these studies are used within my second theme, applied research, to evaluate efficacy of nutritional management strategies to enhance productivity and health of beef cattle, dairy cattle, and sheep.


  • Ph.D., University of Alberta
  • M.Sc., University of Saskatchewan 
  • B.S.A., University of Saskatchewan 

Selected Publications

Rosser, C.L., A.D. Beattie, H.C. Block, J.J. McKinnon, H.A. Lardner, P. Górka, and G.B. Penner. 2016. Effect of maturity at harvest for whole-crop barley and oat on dry matter intake, sorting, and digestibility when fed to beef cattle. J. Anim. Sci. 94: 697-708

Górka, P., E. Castillo-Lopez, F. Joy, G.E. Chibisa, J.J. McKinnon, and G.B. Penner. 2015. Effect of including high-lipid by-product pellets in substitution for barley grain and canola mean in diets for beef cattle on rumen fermentation and nutrient digestibility. J. Anim. Sci. 93:4891-4902.

Wood, K.M., S. Palmer, M.A. Steele, J. Metcalf, and G.B. Penner. 2015. Effect of age and weaning on permeability of the gastrointestinal tract in Holstein bull calves. J. Dairy Sci. 98:7226–7237.

Schurmann, B.L., M.E. Walpole, P. Górka, J.C.H. Ching, M.E. Loewen, and G.B. Penner. 2014. Short-term adaptation of the ruminal epithelium involves abrupt changes in sodium and short-chain fatty acid transport. Am. J. Physiol. Reg. Integ. Comp. 307:R802-R816

Castillo-Lopez, E., B.I. Wiese, S. Hendrick, J.J. McKinnon, T.A. McAllister, K.A. Beauchemin, and G.B. Penner. 2014. Incidence, prevalence, severity, and risk factors for ruminal acidosis in feedlot steers during backgrounding, diet transition, and finishing. J. Anim. Sci. 92:3053-3063


  • ANSC 250.3 - Sheep and goat management
  • ANSC 315.3 - Animal and poultry nutrition
  • ANSC 410.3 - Cow-calf management
  • ANSC 492.3 - Thesis in Animal Science
  • ANSC 815.3 - Advanced ruminant nutrition
  • VBMS 828.3 - Gastrointestinal physiology
  • ANSC 820.3 - Energetics and micronutrient nutrition