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Costa, Madelene, 2013. Klostridier och jästsvamp i ensilage – orsak, verkan och samverkan. First cycle, G2E. Skara: SLU, Dept. of Animal Environment and Health

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Abstract

Yeast and Clostridia is a problem in silage for farmers as contaminated silage may result in poor animal health and milk quality. Clostridia can produce toxins that, when consumed, acts as neurotoxins, it may also cause blown cheeses if the Clostridia contaminates milk. The purpose of this study was to investigate the cause, effect and interaction of yeasts and Clostridia in silage. Clostridia are microorganisms which are strictly anaerobic and consume carbohydrates and protein in the silage. Yeast is a fungus that is facultative aerobic and feed on carbohydrates in the silage. The reason that yeast and Clostridia occur in silage is mainly caused by that the pH is not reduced in an anaerobic environment or because an anaerobic environment is not maintained in the silage, due mainly to oxygen ingress and holes in the plastic that provides air access to the silage. Yeast and Clostridia consume carbohydrates and proteins in the silage, which result in losses of nutrients. There is an interaction between yeast and Clostridia although they have completely different ecological niches. The most probable situation is that yeast creates an anaerobic environment for Clostridia when it consumes the oxygen in the silage. Therefore, Clostridia and yeast are usually found on the surface layer of silage where it has been an aerobic environment. There is a need for more studies on how yeast and Clostridia interact in different types of silages.

Main title:Klostridier och jästsvamp i ensilage – orsak, verkan och samverkan
Authors:Costa, Madelene
Supervisor:Nadeau, Elisabet
Examiner:Arvidsson, Katarina
Series:Studentarbete / Sveriges lantbruksuniversitet, Institutionen för husdjurens miljö och hälsa
Volume/Sequential designation:500
Year of Publication:2013
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:VK001 Animal Science - Bachelor's Programme 180 HEC
Department:(VH) > Dept. of Animal Environment and Health
Keywords:ensilage, klostridium, jästsvamp, syretillgång, näringsinnehåll, gräsensilage, majsensilage, silage, clostridium, yeast, oxygen availability, nutrient composition, grass silage, maize silage
URN:NBN:urn:nbn:se:slu:epsilon-s-2943
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-2943
Subjects:Animal feeding
Language:Swedish
Deposited On:10 Dec 2013 14:42
Metadata Last Modified:10 Dec 2013 14:42

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