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Báo cáo khoa học: "Survival of Listeria monocytogenes in Wilted and Additive-Treated Grass Silage"

Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Survival of Listeria monocytogenes in Wilted and Additive-Treated Grass Silage. | Acta vet. scand. 2003 44 73-86. Survival of Listeria monocytogenes in Wilted and Additive-Treated Grass Silage By T.M. Pauly and WA. Tham2 Department of Animal Nutrition Management Kungsăngen Research Centre and 2Department of Food Hygiene Swedish University of Agricultural Sciences SLU Uppsala Sweden. Pauly TM Tham WA Survival of Listeria monocytogenes in wilted and additive-treated grass silage. Acta vet. scand. 2003 44 73-86. - 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 food-borne 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 listeria counts 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 . additive formic acid lactic acid bacteria wilting dry matter water activity pH. Introduction Listeria monocytogenes is the causative organism of the disease listeriosis which affects both man and a wide range of animals with manifestations such as .