Die-Off of E. coli and Enterococci in Dairy Cowpats

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dc.contributor.author Soupir, Michelle
dc.contributor.author Mostaghimi, Saied
dc.contributor.author Soupir, Michelle
dc.contributor.author Lou, Jianying
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:43:55.000
dc.date.accessioned 2020-06-29T22:38:15Z
dc.date.available 2020-06-29T22:38:15Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.embargo 2013-01-08
dc.date.issued 2008-01-01
dc.description.abstract <p>E. 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.</p>
dc.description.comments <p>This article is from <em><a href="http://elibrary.asabe.org/abstract.asp?aid=25403&t=3&dabs=Y&redir=&redirType=" target="_blank">Transactions of the ASABE</a> </em>51, no. 6 (2008): 1987–1996.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/244/
dc.identifier.articleid 1244
dc.identifier.contextkey 3568179
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/244
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/990
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/244/Soupir_2008_DieOffEcoliEnterococci.pdf|||Fri Jan 14 22:53:31 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Die-off
dc.subject.keywords E. coli
dc.subject.keywords Enterococci
dc.subject.keywords TMDL
dc.subject.keywords Water quality
dc.title Die-Off of E. coli and Enterococci in Dairy Cowpats
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 04becbfb-7a97-4d96-a0dd-5514295530ee
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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