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Cattle Feedlot Soil Moisture and Manure Content

II. Impact on Escherichia coli O157

USDA-ARS, U.S. Meat Animal Research Center, P.O. Box 166, Clay Center, NE 68933-0166

View larger version (47K): [in a new window]   Fig. 1. Effects of water content and manure level on populations of Escherichia coli O157:H7 ATCC 43895, and indigenous generic E. coli and total coliforms in feedlot soils during storage at room temperature. Water content was maintained by daily addition of deionized distilled H2O. The minimum detection level is marked by dashed lines and was 1.00 log10 colony forming units (CFU) g–1 of dry feedlot surface material (FSM). The standard errors of the least squares means were 0.15, 0.20, and 0.18 for E. coli O157:H7, generic E. coli, and total coliforms, respectively.

View larger version (21K): [in a new window]   Fig. 2. Effect of fluctuating water contents on populations of naturally occurring Escherichia coli O157, generic E. coli, and total coliforms in feedlot soils containing 25% manure. The pans were filled with three different masses of soils to attain high, intermediate, and low moisture flux ranges. Appropriate volumes of deionized distilled H2O were added weekly to return the soils to the initial water content of 0.78 g H2O g–1 of dry feedlot surface material (FSM). Where indicated by arrows, feedlot soil samples were enriched to determine the presence or absence of E. coli O157 on Days 35, 49, and 63. The three symbols at Day 35 indicate that two high moisture flux samples and one intermediate moisture flux sample were positive for E. coli O157 by enrichment. The standard errors of the least squares means were 0.21 and 0.20 for generic E. coli and total coliforms, respectively.