Tanya F. Gressley, Ph.D.

Education

  • Ph.D. Dairy Science, University of Wisconsin, 2005
  • M.S. Animal Science, University of Maryland, 1999
  • B.S. Animal Science, University of Maryland, 1997

Primary Courses

Research

  • Our lab is focused on dairy cattle nutrition and the impact nutrition has on cow health. Current projects include: evaluating the immune profile of intestinal tissue, evaluating in vitro measures of neutrophil function, and projects related to trace mineral and rumen protected amino acid nutrition.

Recent Publications

Journal Articles:

Gressley, T. F., K. A. Davison, J. Macies, L. M. Nemec, and M. M. McCarthy. Effect of carbohydrate source, dosing schedule, and abomasal yeast on measures of intestinal fermentation following abomasal carbohydrate infusion. In review.

McCarthy, M. M., M. A. Engstrom, E. Azem, and T. F. Gressley. 2013. The effect of an exogenous amylase on performance and total tract digestibility in lactating dairy cows fed a high by-product diet. J. Dairy Sci. 96:3075-3084.

Hengst, B. A., L. M. Nemec, R. R. Rastani, and T. F. Gressley. Effect of conventional and intensified milk replacer feeding programs on performance, vaccination response, and neutrophil mRNA levels of Holstein calves. J. Dairy Sci. 95:5182-5193.

Nemec, L. M., J. D. Richards, C. A. Atwell, D. E. Diaz, G. I. Zanton, and T. F. Gressley. Immune responses in lactating Holstein cows supplemented with Cu, Mn, and Zn as sulfates or methionine hydroxy analogue chelates. J. Dairy Sci. 95:4568-4577.

Gressley, T. F. 2012. Bioactive agents of milk/dairy products. In Encyclopedia of Biotechnology in Agriculture and Food. Taylor and Francis: New York, Published online: 05 Jan 2012; 1-3.

Mainardi, S. R., B. A. Hengst, S. J. Nebzydoski, L. M. Nemec, and T. F. Gressley. 2011. Effects of abomasal oligofructose on blood and feces of Holstein steers. J. Anim. Sci. 89:2510-2517.

Gressley, T. F., M. B. Hall, and L. E. Armentano. 2011. Ruminant nutrition symposium: Productivity and health responses to hindgut acidosis in ruminants. J. Anim. Sci. 89:1120-1130.

Nebzydoski, S. J., S. Pozzo, L. M. Nemec, M. K. Rankin, and T. F. Gressley. 2010. The effect of dexamethasone on clock gene mRNA levels in bovine neutrophils and lymphocytes. Vet. Immunol. Immunopathol. 138:183-192.

Research Abstracts:

Barnard, A. M. , R. Nebenhaus, R. M. Dyer, and T. F. Gressley. 2014. The effects of CO2 and HEPES buffer on in-vitro chemotaxis assays of bovine neutrophils. J. Dairy Sci. 97 (E-Suppl. 1):183.

Barnard, A. M., R. Nebenhaus, S. Polukis, and T. F. Gressley. 2014. Effects of CO2 and filter pore size on bovine neutrophil chemotaxis. J. Dairy Sci. 97 (E-Suppl. 1):418.

Gressley, T. F., M. J. de Veth, N. K. Diana, and E. Mackey. 2012.

Evaluating in situ procedures for testing lipid encapsulated products – lysine as an example. ADSA 2012 Annual Meeting, 7/17/12.

McCarthy, M. M., M. A. Engstrom, E. Azem, and T. F. Gressley. 2011. The effect of an exogenous amylase on performance and total tract digestibility in lactating dairy cows. J. Dairy Sci. 94(E-Suppl.1):207.

Kurman, C. A., M. McCarthy, L. M. Nemec, and T. F. Gressley. 2011. Serum shock did not synchronize clock gene expression in primary bovine hepatocyte cultures. J. Dairy Sci. 94(E-Suppl.1):597.

Davison, K., R. L. Hougentogler, C. Leonardi, M. M. McCarthy, L. M. Nemec, and T. F. Gressley. 2011. Effect of post-ruminal Saccharomyces boulardii on fecal parameters and nutrient digestibility in Holstein steers given abomasal oligofructose. J. Dairy Sci. 94(E-Suppl.1):364.

Nemec L.M., C. Wu, S. Cordova, K. Davison, and T. F. Gressley. 2010. The effect of thymol on intracellular and extracellular reactive oxygen species production by bovine neutrophils. J. Dairy Sci. 93(E-Suppl. 1):313.

Nemec, L.M., J. D. Richards, C. Atwell, D. E. Diaz, and T. F. Gressley. 2010. The effect of form of trace mineral supplements on performance, neutrophil function and vaccination response in lactating Holstein cows. J. Dairy Sci. 93(E-Suppl. 1):176.

Hengst, B. A., L. M. Nemec, R. R. Rastani, and T. F. Gressley. 2010. Measurement of adaptive and innate immune function in calves raised under traditional and accelerated growth regimens. J. Dairy Sci. 93(E-Suppl. 1):418.

Mainardi, S. R., B. A. Hengst, S. J. Nebzydoski, L. M. Nemec, and T. F. Gressley. 2010. Abomasal oligofructose infusion induced hindgut acidosis in Holstein steers. J. Dairy Sci. 93(E-Suppl. 1):722.

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Contact Information
Tanya F. Gressley, Ph.D.

Associate Professor
Dairy Nutritionist

Animal and Food Sciences
044 Townsend Hall

Newark, DE 19716
Phone: (302) 831-1940
Fax number: (302) 831-2822
Email: gressley@udel.edu