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United States Department of Agriculture

Agricultural Research Service

Livestock GRACEnet Researchers
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The Livestock GRACEnet team is made up of 24 scientists from 13 locations working on the effects of livestock production on emissions and air quality.  The team covers poultry, swine, beef and dairy cattle.  Read about our scientists and their research below.  Feel free to contact any of us for more information about our projects!

Dr. John Brooks, Mississippi State, MS

Dr. Andy Cole, is a Research Animal Scientist (Nutrition) and Research Leader with USDA- Agricultural Research Service, Conservation and Production Research Laboratory in Bushland, Texas.  His independent and team research programs are designed around the following five objectives: (1) quantify emissions of ammonia and greenhouse gases from beef cattle and beef cattle feedyards  (2) develop an improved understanding of the chemical and physical mechanisms regulating ammonia and greenhouse gas emissions from animal feeding operations, (3) develop dietary and management strategies to increase efficiency of nutrient utilization and decrease emissions of ammonia and greenhouse gases from feedyards, (4) improve the utilization of by-product feeds such as distillers grains by beef cattle, and (5) develop models to efficiently estimate emissions from feedlots.

Dr. Kimberly Cook, Animal Waste Management Research Unit, Bowling Green, KY

Dr. Kristin Hales, U.S. Meat Animal Research Center, Clay Center, NE

Dr. Cathleen Hapeman, Environmental Managment and Byproduct Utilization Laboratory, Beltsville, MD

Dr. Scott Kronberg, is a Animal Scientist with ARS at the Northern Great Plains Research Laboratory in Mandan, North Dakota.  One aspect of his research has focused on reducing ammonia and greenhouse gas emissions from grazing cattle and sheep.  For this, he has studied the possibility of putting small amounts of condensed tannin into cattle and sheep via their drinking water to reduce the amount of urea excreted in their urine, which can be converted into ammonia and nitrous oxide.

Dr. April Leytem is a Soil Scientist at the Northwest Irrigation and Soils Research Laboratory at Kimberly, Idaho.  Her research examines nutrient cycling and losses in dairy production systems.  Current focus is on determining emissions of ammonia, methane and nitrous oxide from dairy housing, manure managment systems, and land application of manures.

Dr. John Loughrin, Animal Waste Management Research Unit, Bowling Green, KY

Dr. Nanh Lovanh, Animal Waste Management Research Unit, Bowling Green, KY

Dr. Laura McConnell is a Research Chemist at the Environmental Managment and Byproduct Utilization Laboratory, Beltsville, MD. She specializes in the investigation of the processes controlling the environmental fate and transport of pesticides, volatile organic compounds and other pollutants from agricultural operations.   The ultimate goal of her research is to support the development of more sustainable farming systems that will minimize negative impacts on surrounding ecosystems.

Dr. Dana McGee Miles, is a Chemical Engineer with USDA-Agricultural Research Service, Crop Science Research Laboratory in the Genetics and Precision Agriculture Research Unit at Mississippi State, Mississippi.  The primary objective of her current research is to determine ammonia and greenhouse gas (GHG) emissions from broiler houses and manured fields and develop management practices to reduce them.   The objective will be met by: (1) identifying environmental and management factors that influence ammonia, carbon dioxide, nitrous oxide and methane from commercial broiler houses in the southeastern U.S.; (2) determining pathways for reducing ammonia and carbon dioxide emissions from litter or soil using physical manipulation and various litter amendments; and (3) developing techniques for litter application and agronomic practices to reduce soil flux of ammonia and GHG. 

Dr. Dan Miller, is a Microbiologist at the Agroecosystems Management Research Unit in Lincoln, Nebraska.  His research program investigates the role of microorganisms in manure-impacted environments both in the formation of odorous compounds and in nutrient transformation.  Current research projects include investigating nitrogen cycling in vegetative treatment areas handling feedlot runoff, hydrogen sulfide emissions from feedlot pens,  odor compound formation in swine manure storages, and the microorganisms involved in swine manure pit foaming.

Dr. Philip Moore, Poultry Production adn Product Safety Research Unit, Fayetteville, AR

Dr. Jeff Novak, Coastal Plains Soil, Water, and Plant Research Center, Florence, SC

Dr. Mark Powell, is a Research Soil Scientist with USDA- Agricultural Research Service, US Dairy Forage Research Center (USDFRC) in Madison Wisconsin. His current research has four objectives: (1) develop ammonia and greenhouse gas (GHG) emission abatement strategies for barns, outside cattle-holding areas, and other dairy farm components; (2) determine the effects of dairy diets on soluble nutrient forms (e.g., urine N) in manure, ammonia and GHS emissions, and the environmental performance of dairy farms; (3) develop herd and manure management practices that improve manure collection, distribution and recycling in soils/crops-pasture on dairy farms; and manure land application techniques that minimize nutrient loss via ammonia and GHG emissions, nitrate leaching, and runoff and (4) develop tools for farmers and farm advisors to measure, monitor and evaluate nutrient use efficiency and GHG emissions in dairy production components, and to improve overall nutrient use, nutrient balances and environmental impacts of dairy production.

Dr. Kyoung Ro, Coastal Plains Soil, Water, and Plant Research Center, Florence, SC

Dr. C. Alan Rotz is an Agricultural Engineer at the Pasture Systems and Watershed Management Research Unit at University Park, Pennsylvania. He leads a project on whole farm modeling and evaluation of the performance, environmental impacts, and economics of integrated animal and crop production systems. The current emphasis of this work is on process level modeling of gaseous emissions from farms including ammonia, hydrogen sulfide, volatile organic compounds, and greenhouse gases. Products of this effort are the Integrated Farm System Model (IFSM) and the Dairy Gas Emission Model (DairyGEM). These software tools are available for download at http://www.ars.usda.gov/main/docs.htm?docid=2708.

Dr. Ariel Szogi, Coastal Plains Soil, Water, and Plant Research Center, Florence, SC

Dr. Phil Silva, Animal Waste Management Research Unit, Bowling Green, KY

Dr. Karamat Sistani, Animal Waste Management Research Unit, Bowling Green, KY

Dr. Mindy Spiehs, U.S. Meat Animal Research Center, Clay Center, NE

Dr. Rick Todd, Conservation and Production Research Laboratory, Bushland, TX

Dr. Steve Trabue, National Laboratory for Agriculture and the Environment, Ames, IA

Dr. Matias Vanotti, Coastal Plains Soil, Water, and Plant Research Center, Florence, SC

Dr. Brian Woodbury, U.S. Meat Animal Research Center, Clay Center, NE


Last Modified: 5/15/2012