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There is a growing concern about the presence of pathogens in cattle manure and its implications on human and environmental health. The phytochemical-rich forage sainfoin (Onobrychis viciifolia ) and purified phenolics (trans -cinnamic acid,p -coumaric acid, and ferulic acid) were evaluated for their ability to reduce the viability of pathogenicEscherichia coli strains, includingE. coli O157:H7. MICs were determined using purified phenolics and acetone extracts of sainfoin and alfalfa (Medicago sativa ), a non-tannin-containing legume. Ground sainfoin or pure phenolics were mixed with fresh cattle feces and inoculated with a ciprofloxacin-resistant strain ofE. coli , O157:H7, to assess its viability at −20°C, 5°C, or 37°C over 14 days. Forty steers were fed either a sainfoin (hay or silage) or alfalfa (hay or silage) diet over a 9-week period. In the in vitro study, the MICs for coumaric (1.2 mg/ml) and cinnamic (1.4 mg/ml) acids were 10- to 20-fold lower than the MICs for sainfoin and alfalfa extracts. In the inoculated feces, the −20°C treatment had death rates which were at least twice as high as those of the 5°C treatment, irrespective of the additive used. Sainfoin was less effective than coumaric acid in reducingE. coli O157:H7 Cipr in the inoculated feces. During the animal trial, fecalE. coli numbers declined marginally in the presence of sainfoin (silage and hay) and alfalfa silage but not in the presence of hay, indicating the presence of other phenolics in alfalfa. In conclusion, phenolic-containing forages can be used as a means of minimally reducingE. coli shedding in cattle without affecting animal production.

applied and environmental microbiology

Potential To Reduce <i>Escherichia coli</i> Shedding in Cattle Feces by Using Sainfoin ( <i>Onobrychis viciifolia</i> ) Forage, Tested In Vitro and In Vivo

Potential To Reduce Escherichia coli Shedding in Cattle Feces by Using Sainfoin ( Onobrychis viciifolia ) Forage, Tested In Vitro and In Vivo