HR: 1340h
AN: H33F-1702    [Abstracts]
TI: Pathogens in Dairy Farming: Source Characterization and Groundwater Impacts
AU: Atwill, E R
EM: ratwill@ucdavis.edu
AF: School of Veterinary Medicine, University of California, Davis, CA 95616,
AU: * Watanabe, N
EM: naowatanabe@ucdavis.edu
AF: Dept. of Land, Air, and Dept. of Land, Air, and Water Resources, University of California Veihmeyer Hall, Davis, CA 95616,
AU: Li, X
AF: School of Veterinary Medicine, University of California, Davis, CA 95616,
AU: Hou, L
AF: School of Veterinary Medicine, University of California, Davis, CA 95616,
AU: Harter, T
EM: ThHarter@ucdavis.edu
AF: Dept. of Land, Air, and Dept. of Land, Air, and Water Resources, University of California Veihmeyer Hall, Davis, CA 95616,
AU: Bergamaschi, B
EM: bbergama@usgs.gov
AF: U.S. Geological Survey, Placer Hall 6000 J. Street, Sacramento, CA 95819,
AB: Intense animal husbandry is of growing concern as a potential contamination source of enteric pathogens as well as antibiotics. To assess the public health risk from pathogens and their hydrologic pathways, we hypothesize that the animal farm is not a homogeneous diffuse source, but that pathogen loading to the soil and, therefore, to groundwater varies significantly between the various management units of a farm. A dairy farm, for example, may include an area with calf hutches, corrals for heifers of various ages, freestalls and exercise yards for milking cows, separate freestalls for dry cows, a hospital barn, a yard for collection of solid manure, a liquid manure storage lagoon, and fields receiving various amounts of liquid and solid manure. Pathogen shedding and, hence, therapeutic and preventive pharmaceutical treatments vary between these management units. We are implementing a field reconnaissance program to determine the occurrence of three different pathogens ( E. coli, Salmonella, Campylobacter) and one indicator organism ( Enterococcus) at the ground-surface and in shallow groundwater of seven different management units on each of two farms, and in each of four seasons (spring/dry season, summer/irrigation season, fall/dry season, winter/rainy season). Initial results indicate that significant differences exist in the occurrence of these pathogens between management units and between organisms. These differences are weakly reflected in their occurrence in groundwater, despite the similarity of the shallow geologic environment across these sites. Our results indicate the importance of differentiating sources within a dairy farm and the importance of understanding subsurface transport processes for these pathogens.
UR: http://groundwater.ucdavis.edu
DE: 0402 Agricultural systems
DE: 0465 Microbiology: ecology, physiology and genomics (4840)
DE: 1803 Anthropogenic effects (4802, 4902)
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
SC: Hydrology [H]
MN: 2007 Fall Meeting