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Numbers of fecal streptococci and Escherichia coli in fresh and dry cattle, horse, and sheep manure

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Livestock are known contributors to stream pollution. Numbers of fecal streptococci and Escherichia coli in manure naturally deposited by livestock in the field are needed for activities related to bacterial source tracking and determining maximum daily bacterial loading of streams. We measured populations of fecal streptococci and E. coli in fresh and dry manure from cattle (Bos taurus L.), horses (Equus caballus L.), and sheep (Ovis aires L.) on farms in southern Idaho. Populations of indicator bacteria in dry manure were often as high as that in fresh manure from horse and sheep. There was a 2 log10 drop in the population of fecal coliform numbers in dry cattle manure from cattle in pastures but not from cattle in pens. Bacterial isolates used in source tracking should include isolates from both fresh and dry manure to better represent the bacterial source loading of streams.Key words: enterococci, E. coli, fecal streptococci, bacterial indicators, bacterial source tracking, pollution.

Il est reconnu que les animaux d'élevage contribuent à la pollution des cours d'eau. Un certain nombre d'entérococques, de streptocoques fécaux et Escherichia coli dans le fumier déposé naturellement par le bétail dans le champ sont nécessaires pour accomplir les activités reliées au repérage des sources et à l'estimation de la charge maximale bactérienne quotidienne dans les cours d'eau. Nous avons mesuré les populations de streptocoques fécaux et de E. coli dans le fumier frais et sec de vaches (Bos taurus L.), de chevaux (Equus caballus L.) et de moutons (Ovis aires L.) de fermes du sud de l'Idaho. Les populations de bactéries indicatrices dans le fumier sec étaient souvent aussi élevées que dans le fumier frais provenant de chevaux ou de moutons. Une chute de 2 log10 des populations de coliformes fécaux fut détectée dans le fumier sec de vaches provenant de pâturages mais non de vaches dans des enclos. Des isolats bactériens utilisés dans le repérage des sources devraient inclure des isolats aussi bien de fumier frais que sec afin de mieux représenter les sources de charge bactérienne dans les cours d'eau.Mots clés : entérococques, E. coli, streptocoques fécaux, indicateurs bactériens, repérage de sources bactériennes, pollution.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-09-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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