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Report chapter, 2014

Dynamics of gas formation during ensilage

Knicky, Martin; Wiberg, Hans-Gunnar; Eide, Fredrik; Gertzell, Bengt


The formation of a whole spectrum of gasses, which is undesirable occurs during ensiling process. The formation of gasses is undesirable, because it is often a sign of undesirable processes in silages, and causes concern about the impact on the global environment. Formation of CO2 is the most abundant. Besides CO2, the formation of toxic N oxides also occurs during ensiling. Since silage additive addition affects the fermentation pattern, the aim of the study was to monitor the formation of various gasses from silages treated with different silage additives. A grass ley (70% timothy) was harvested on August 24th 2013, nearby Helsingborg. Bacterial inoculant (E. faecium, L. plantarum, L. buchneri) at the rate of 250000 cfu/g FF, and silage additive Safesil at the rate of 3 L/ton FF were compared with untreated control. Gasses collected in bags were analysed for N2, H2, O2, CO, CH4 by gas chromatographaphy. CO2, NO, and NO2 were absorbed in water and analysed using ion chromatography. Standard analyses to determine silage quality were performed after ensiling period. Silages treated with bacterial inoculant had significantly higher pH, propionic acid, acetic acid, and ethanol contents but lower concentration of lactic acid than other silage treatments. Control and bacterially inoculated silages produced more gas than Safesil treated silages, mainly due to an increased proportion of CO2. The formation of NOx gases displayed no significant differences among other treatments.

Published in

Rapport / Sveriges lantbruksuniversitet, Institutionen för husdjurens utfodring och vård
2014, number: 290, pages: 41-46
Book title: Proceedings of the 5th Nordic Feed Science Conference, Uppsala, Sweden
Publisher: Organising committee of the 5th Nordic Feed Science Conference, Dept. of Animal Nutrition and Management, SLU, SE-75323, Uppsala, Sweden

Authors' information

Swedish University of Agricultural Sciences, Department of Animal Nutrition and Management
Wiberg, Hans-Gunnar
Coor Service Management
Eide, Fredrik
Hanson and Möhring
Gertzell, Bengt
Hanson and Möhring

UKÄ Subject classification

Animal and Dairy Science

URI (permanent link to this page)