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Methane production in dairy cows

impact of feed and rumen microbiota

Danielsson, Rebecca (2016). Methane production in dairy cows. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2016:45
ISBN 978-91-576-8592-6
eISBN 978-91-576-8593-3
[Doctoral thesis]

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Abstract

Greenhouse gas emissions from the agricultural sector represent about 14.5% of total emissions related to human activity. Approximately 40% of agricultural sector emissions derive from enteric methane (CH₄) production by ruminants, due to their microbial digestion of feed. Level of CH₄ production varies according to feed type, feed intake and even among individual animals raised under similar conditions, but the underlying mechanism is not well known. This thesis investigated the effects of feed, feed additives, and rumen microbiota on CH₄ production within dairy cows and in a gas in vitro system. Effect of individual cow was stronger than effect of diet for both CH₄ production and methanogenic population when two different levels of forage proportions were fed. Dividing Methanobrevibacter species into two groups better explained the variation in CH₄ production. The effect of individual was evaluated in cows fed the same diet during mid-lactation. High, low and medium emitters were identified and selected for further studies on rumen microbiota. These revealed that CH₄ production was associated with archaeal and bacterial community structure. Differences were observed in volatile fatty acid proportions between communities, but not in fibre digestion or milk production. Tests on feed additives, cashew nut shell extract (CNSE) and glycerol in a gas in vitro system for their ability to reduce CH₄ production showed that CNSE reduced CH₄ production by 18% and had a strong impact on microbiota, while glycerol increased CH₄ production by 12% and had less effect on microbiota compared with the control. Comparison of microbial composition in inoculum from the in vitro control and in inoculum from the donor cow before incubation revealed that the bacterial community was relatively similar, while relative abundance of some species changed for archaeal population. This effect of transfer into another system should be considered when evaluating in vitro data. Evaluation of the in vitro system by comparing predicted and observed CH₄ production on 49 test diets showed an overall good relationship, with small root mean square error for prediction (12.3% and 9.5% of observed mean for fixed and mixed models, respectively). However, the in vitro system had limitations in prediction of concentrate proportion.

Authors/Creators:Danielsson, Rebecca
Title:Methane production in dairy cows
Subtitle:impact of feed and rumen microbiota
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :22 April 2016
Depositing date:26 April 2016
Volume:2016:45
Number of Pages:83
Papers/manuscripts:
NumberReferences
IDanielsson, R., A. Schnürer, V. Arthurson and J. Bertilsson (2012). Methanogenic population and CH₄ production in Swedish dairy cows fed different levels of forage. Applied and Environmental Microbiology 78(17), 6172-6179.
IIDanielsson R., J. Dicksved, L. Sun, B. Müller, H. Gonda, A. Schnürer and J. Bertilsson. Methane production in dairy cows correlates with rumen methanogenic and bacterial community structure (manuscript).
IIIDanielsson, R., A. Werner-Omazic, M. Ramin, A. Schnürer, M. Griinari, J. Dicksved, and J. Bertilsson (2014). Effects on enteric methane production and bacterial and archaeal communities by the addition of cashew nut shell extract or glycerol—An in vitro evaluation. Journal of Dairy Science 97(9), 5729-5741.
IVDanielsson, R., R. Mohammad, J. Bertilsson, P. Lund and P. Huhtanen. Evaluation of an in vitro system for predicting methane production in vivo (manuscript).
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8592-6
ISBN for electronic version:978-91-576-8593-3
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
L Animal production > L51 Animal physiology - Nutrition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Agrovoc terms:dairy cows, methane, greenhouse gases, methane emission, methane fermentation, feed intake, cashews, nuts, glycerol, feed supplements, bacterial flora, rumen microorganisms, methanogens, volatile fatty acids, in vitro
Keywords:Methane, Dairy cattle, in vitro gas production, Diet composition, microbial community structure, Methanogens, Cashew nut shell extract
URN:NBN:urn:nbn:se:slu:epsilon-e-3404
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3404
ID Code:13308
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
External funders:FORMAS
Deposited By: PhD Rebecca Danielsson
Deposited On:27 Apr 2016 11:22
Metadata Last Modified:06 Aug 2017 10:03

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