Die-off of E. coli and enterococci in dairy cowpats

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dc.contributorVirginia Techen
dc.contributor.authorSoupir, M. L.en
dc.contributor.authorMostaghimi, Saieden
dc.contributor.authorLou, J.en
dc.contributor.departmentBiological Systems Engineeringen
dc.contributor.departmentStatisticsen
dc.date.accessed2014-05-29en
dc.date.accessioned2014-05-30T13:13:46Zen
dc.date.available2014-05-30T13:13:46Zen
dc.date.issued2008en
dc.description.abstractE. coli and enterococci re-growth and decay patterns in cowpats applied to pasturelands were monitored during the spring, summer fall, and winter First-order approximations were used to determine die-off rate coefficients and decimal reduction times (D-values). Higher-order approximations and weather parameters were evaluated by multiple regression analysis to identify environmental parameters impacting in-field E. coli and enterococci decay. First-order kinetics approximated E. coli and enterococci decay rates with regression coefficients ranging from 0.70 to 0.90. Die-off rate constants were greatest in cowpats applied to pasture during late winter and monitored into summer months for E. coli (k = 0.0995 d(-1)) and applied to the field during the summer and monitored until December for enterococci (k = 0.0978 d(-1)). Decay rates were lowest in cowpats applied to the pasture during the fall and monitored over the winter (k = 0.0581 d(-1) for E. coli, and k = 0.0557 d(-1) for enterococci). Higher-order approximations and the addition of weather variables improved regression coefficients to values ranging from 0.82 to 0.96. Statistically significant variables used in the models for predicting bacterial decay included temperature, solar radiation, rainfall, and relative humidity. Die-off rate coefficients previously reported in the literature are usually the result of laboratory-based studies and are generally higher than the field-based seasonal die-off rate coefficients presented here. To improve predictions of in-field E. coli and enterococci concentrations, this study recommends that higher-order approximations and additional parameters such as weather variables are necessary to better capture re-growth and die-off trends over extended periods of time.en
dc.description.sponsorshipUSDA Cooperative State Research, Education, and Extension Service (CSREES) Fooden
dc.description.sponsorshipAgricultural Sciences National Needs Graduate Fellowshipen
dc.description.sponsorshipPolicy Institute Graduate Fellowship Programen
dc.description.sponsorshipNational Science Foundation SBE-02449.1.6en
dc.description.sponsorshipEPA 9.1.67750.1-0en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSoupir, M. L.; Mostaghimi, S.; Lou, J., "Die-off of E. coli and enterococci in dairy cowpats," Transactions of the ASABE. 51(6): 1987-1996. (doi: 10.13031/2013.25403) @2008en
dc.identifier.doihttps://doi.org/10.13031/2013.25403en
dc.identifier.issn2151-0032en
dc.identifier.urihttp://hdl.handle.net/10919/48198en
dc.identifier.urlhttp://elibrary.asabe.org/abstract.asp?aid=25403&t=3&dabs=Y&redir=&redirType=en
dc.language.isoenen
dc.publisherAmerican Society of Agricultural and Biological Engineersen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectDie-offen
dc.subjectE. coli (Bacterium)en
dc.subjectEnterococcien
dc.subjectTMDLen
dc.subjectWater qualityen
dc.subjectEscherichia colien
dc.subjectFecal bacteriaen
dc.subjectBacteriological qualityen
dc.subjectIndicatoren
dc.subjectBacteriaen
dc.subjectPoultry manureen
dc.subjectCow manureen
dc.subjectSurvivalen
dc.subjectCattleen
dc.subjectFateen
dc.subjectTransporten
dc.subjectAgricultureen
dc.titleDie-off of E. coli and enterococci in dairy cowpatsen
dc.title.serialTransactions of the ASABEen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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