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

Current Courses

Research

  • To examine aspects of dairy cattle nutrition as they relate to cow health. Current projects include: measuring effect of feed supplements on white blood cell function, evaluating feed supplement effects on post-ruminal fermentation, and evaluating in vitro measures of cow health.

Recent Publications

Journal Articles:

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. In press

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. In press.

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.

Brickner, A. E., J. A. A. Pires, T. F. Gressley, and R. R. Grummer. 2009. Effects of abomasal lipid infusion on liver triglyceride accumulation and adipose lipolysis during fatty liver induction in dairy cows. J. Dairy Sci. 92:4954-4961.

Velasco, J. M., E. D. Reid, K. K. Fried, T. F. Gressley, R. L. Wallace, and G. E. Dahl. 2008. Short-day photoperiod increases milk yield in cows with a reduced dry period length. J. Dairy Sci. 91: 3467-3473.

Mikolayunas, C. M., D. L. Thomas, G. E. Dahl, T. F. Gressley, and Y.M. Berger. 2008. Effect of prepartum photoperiod on milk production and prolactin concentration of dairy ewes. J. Dairy Sci. 91:85-90.

Research Abstracts:

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.

Pozzo, S. S., M. K. Rankin, and T. F. Gressley. 2008. Dexamethasone administration increased bovine lymphocyte clock gene expression in vitro and in vivo. J. Dairy Sci. 91(E-Suppl. 1):3.

Nebzydoski, S. J., L. M. Nemec, and T. F. Gressley. 2008. The effect of the synthetic glucocorticoid dexamethasone on clock gene expression in bovine neutrophils. J. Dairy Sci. 91(E-Suppl. 1):161.

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Contact Information
Tanya F. Gressley, Ph.D.

Assistant Professor
Ruminant Biologist

Animal and Food Sciences
044 Townsend Hall

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