Seasonal and within-herd variability of E.coli concentrations in fresh dairy faeces
Seasonal and within-herd variability of E.coli concentrations in fresh dairy faeces
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DOI：
10.1111/lam.12248
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发表时间：
2014-07-01
影响因子：
2.4
通讯作者：
Oliver, D. M.
中科院分区：
文献类型：
--
作者：
Oliver, D. M.
The aim of this study was to determine concentrations of culturable faecal indicator organisms (FIOs) in freshly excreted dairy faeces and assess seasonal, within-herd and year-on-year variability in counts. Such values are essential in order to provide input parameters and associated uncertainty bounds for empirical models designed to determine the burden of FIOs on pasture. A longitudinal faecal analysis survey (n=80) was conducted at a conventional dairy farm in central Scotland over a 2-year period. The analysis quantified counts of Escherichia coli and other nonE.coli coliforms and compared the concentrations of these FIO groups across contrasting seasons. The overall mean concentration of E.coli was 6 center dot 63 and 6 center dot 58 log10CFUg-1 dry weight in 2012 and 2013, respectively. However, concentrations of E.coli in faecal pats on each seasonal sampling event were highly variable and spanned several orders of magnitude on all occasions. Concentrations of E.coli in faeces excreted in winter were found to be lower than those excreted in all other seasons in 2012, though patterns of seasonal shedding were not consistent in observations the following year highlighting additional sources of uncertainty in FIO loading to land from dairy herds.
