Department of Animal Science

Graduate Student

	Nestor Gutierrez Animal Nutrition Ph.D. Candidate Iowa State University 207 Kildee Ames, IA 50011 Phone: 515-294-2412 Fax: 515-294-1399 Email: nestorgc@iastate.edu Major Professor: John F. Patience
Education B.S., Animal Sciences, National University of Colombia, Bogota – Colombia, 2005 M.S., Animal Sciences, University of Illinois, 2009 Visiting Scholar – Mendel University of Agriculture and Forestry, Brno – Czech Republic, 2004
Research The expansion of the corn-based fuel ethanol and biopolymers industry has led to the increase in the inclusion of corn co-products in swine diets. Typically, these feedstuffs contain a high concentration of fiber, that is also variable depending on the source and type of feedstuff used. High fiber concentration is associated with a reduced efficiency of utilization of energy, as well as having a negative impact on the digestion and utilization of nutrients such as protein, fat and phosphorus. My research project will focus on the determination of the best chemical assays to characterize fiber, the site of digestion of dietary fiber, and the impact of dietary fiber on the utilization of energy, nitrogen and phosphorus in swine diets.
Professional Affiliations American Society of Animal Science
Selected Publications N. A. Gutierrez, D. Y. Kil, and H. H. Stein. 2009. Net energy of distillers dried grains with solubles and high protein distillers dried grains fed to growing and finishing pigs. J. Anim. Sci. 87 (Suppl. 2): In press N. A. Gutierrez, D. Y. Kil, B. G. Kim, and H. H. Stein. 2009. Effects of distillers dried grains with solubles and high protein distillers dried grains on growth performance and organ weights of growing and finishing pigs. J. Anim. Sci. 87 (Suppl. 3): In press