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Survival of Listeria monocytogenes in wilted and additive-treated grass silage
Department of Animal Nutrition & Management, SLU, Uppsala.
Department of Food Hygiene, Swedish University of Agricultural Sciences (SLU), Uppsala.ORCID iD: 0000-0001-6903-5322
2003 (English)In: Acta Veterinaria Scandinavica, ISSN 1751-0147, Vol. 44, 73-86 p.Article in journal (Refereed) Published
Abstract [en]

Grass was field-dried to 3 different dry matter (DM) levels (200, 430 and 540 g/kg) and inoculated with 106-107 cfu/g of a Listeria monocytogenes strain sharing a phagovar occasionally involved in foodborne outbreaks of listeriosis. Formic acid (3 ml/kg) or lactic acid bacteria (8·105/g) with cellulolytic enzymes were applied only to forages with low and intermediate DM levels. Forages were ensiled in laboratory silos (1700 ml) and were stored at 25°C for 30 or 90 days. After 90 days of storage, L. monocytogenes could not be detected in any silo, except one with the high dry matter grass without additive. After 30 days of storage, between 102 and 106 cfu L. monocytogenes/g silage were isolated from the untreated silages. Increasing the DM content from 200 to 540 g/kg did not reduce listeriacounts possibly because of the lower production of fermentation acids (higher pH). In silages treated with additives, counts of L. monocytogenes were always lower than in silages without additive. In wet silages (DM 200 g/kg) both additives were effective, but in the wilted silages (DM 430 g/kg) only the bacterial additive reduced listeria counts below detection level. Listeria counts were highly correlated to silage pH (r = 0.92), the concentration of lactic acid (r = -0.80) and the pooled amount of undissociated acids (r = -0.83).

Place, publisher, year, edition, pages
Vanlose, Denmark: Danske Dyrlageforening , 2003. Vol. 44, 73-86 p.
Keyword [en]
Additive, formic acid, lactic acid bacteria, wilting, dry matter, water activity, pH
National Category
Medical and Health Sciences Food Science
Research subject
Culinary Arts and Meal Science
Identifiers
URN: urn:nbn:se:oru:diva-44324DOI: 10.1186/1751-0147-44-73ISI: 000186439300007PubMedID: 14650546Scopus ID: 2-s2.0-0642279382OAI: oai:DiVA.org:oru-44324DiVA: diva2:806201
Available from: 2015-04-19 Created: 2015-04-19 Last updated: 2017-10-17Bibliographically approved

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