The role of aerobic deterioration in the development of Listeria monocytogenes contamination in silage
1991
Fenlon, D.R. (The Scottish Agricultural College, Aberdeen (United Kingdom)) | Wilson, J.
Silage made under ideal conditions, contains few, if any, Listeria bacteria. When the appropriate anaerobic conditions are created and adequate grass sugars are present the naturally occurring lactic acid microflora rapidly multiply and ferment these sugars, creating a low pH. This acidity causes Listeria to die out in the anaerobic environment established soon after ensiling. The importance of good ensiling techniques in creating conditions hostile to Listeria is readily shown using laboratory silos. When these were filled with grass spiked with 10(6)/g L. monocytogenes and air completely excluded the numbers of the organ ism declined to undetecable levels in 30 days or less. The die-off-rate maybe was enhanced by the use of effective inoculants or additives, which promote a more rapid production of acid conditions. When silage is made on the farm, the elimination of air from the silo, clamp or bale and the prevention of its entry into the silage after sealing is more difficult compared to laboratory ensiling. This is particularly the case with the increasingly popular baled silage. The U.K. increase in listeriosis in sheep has been attributed to a change in their diet fr om hay to silage.
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Эту запись предоставил ZB MED Nutrition. Environment. Agriculture