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Methods to study the relationship between forage composition and silage fermentation and aerobic stability

Mogodiniyai Kasmaei, Kamyar (2016). Methods to study the relationship between forage composition and silage fermentation and aerobic stability. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2016:23
ISBN 978-91-576-8548-3
eISBN 978-91-576-8549-0
[Doctoral thesis]

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This thesis is based on the following hypotheses: (I) under controlled ensiling conditions, forage chemical and microbial composition explain variation in silage end-product concentrations (II) sterilized forage inoculated with parent microflora gives similar fermentation result as untreated control forage and (III) this methodology enables studying interactions between forage source and field flora on silage fermentation and aerobic stability.

Hypothesis (I) was evaluated by constructing regression models of end-products on common forage chemical variables (e.g. dry matter, crude protein) and lactic acid bacterial numbers using data from 66 maize and 52 perennial crop silages. To address hypothesis (II), grass, grass-clover, white clover and maize samples were sterilized by heating, inoculated with parent microfloras and ensiled. Validation was made against untreated control silages. To test hypothesis (III), grass, red clover and maize samples were sterilized by heating and each sterile sample was inoculated with each of the three microfloras, derived from intact samples, before ensiling.

(I) On average, the models captured 43% and 52% of total variation in end-product concentrations in perennial crop and maize silages, respectively.

(II) Reconstituted silages contained lower amounts of lactic acid, ethanol and ammonia (i.e. 18%, 20% and 37%, respectively) but similar amounts of volatile fatty acids and 2,3-butanediol and had similar microbial profiles compared to control silages.

(III) Forage source had marked effects on both end-product formation and silage aerobic stability whereas, field flora mainly affected the aerobic stability.

It is concluded that the new in vitro methodology, in spite of needs for further improvement, allows hypothesis testing on relative effects of field flora and forage species on silage quality. The results also suggest that more detailed information on forage chemical composition, such as data on water activity, pectin, organic acids, etc., could provide additional information for the prediction of ensiling outcome.

Authors/Creators:Mogodiniyai Kasmaei, Kamyar
Title:Methods to study the relationship between forage composition and silage fermentation and aerobic stability
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :February 2016
Depositing date:16 February 2016
Number of Pages:48
IMogodiniyai Kasmaei, K., Rustas, B-O., Spörndly, R. and Udén, P. (2013). Prediction models of silage fermentation products on crop composition under strict anaerobic conditions: A meta-analysis. Journal of Dairy Science 96(10), 6644-6649.
IIMogodiniyai Kasmaei, K., Spörndly, R. and Udén, P. (2013). Research Note: A sterilization technique with application to silage research and inoculant evaluation. Grass and Forage Science 69(4), 724-728.
IIIMogodiniyai Kasmaei, K., Passoth, V., Spörndly, R. and Udén, P. (2014). A new sterilization and inoculation method in silage research. Grass and Forage Science 70(4), 668-673.
IVMogodiniyai Kasmaei, K., Dicksved, J., Spörndly, R. and Udén, P. Separating the effects of forage source and field flora on silage fermentation quality and aerobic stability (submitted).
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Agriculture (until Jan 2017)
SLU - Agricultural Sciences for Global Development > Efficiency in farming systems
ISBN for printed version:978-91-576-8548-3
ISBN for electronic version:978-91-576-8549-0
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
Q Food science > Q52 Feed processing and preservation
Q Food science > Q54 Feed composition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Agrovoc terms:silage, heat sterilizing, heat, inoculation, fermentation, aerobiosis, crops, flora, in vitro experimentation, methods
Keywords:silage, in vitro, methodology, sterilization, heat, reconstitution, inoculation, fermentation, aerobic stability, field flora
Permanent URL:
ID Code:13075
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
External funders:Stiftelsen Lantbruksforskning
Deposited By: Kamyar Mogodiniyai Kasmaei
Deposited On:18 Feb 2016 07:24
Metadata Last Modified:10 Sep 2020 13:41

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