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Methane emissions and rumen microbial changes in steers fed condensed tannin containing diets under western Canadian conditions

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dc.contributor.supervisor Ominski, Kim (Animal Science) Krause, Denis (Animal Science) en_US
dc.contributor.author Bouchard, Kristen
dc.date.accessioned 2011-08-26T16:39:47Z
dc.date.available 2011-08-26T16:39:47Z
dc.date.issued 2011-08-26
dc.identifier.uri http://hdl.handle.net/1993/4779
dc.description.abstract A study was conducted to determine if sainfoin, a condensed tannin (CT) containing legume, fed to beef cattle as hay or silage during a western Canadian winter would result in a reduction in methane (CH4) emissions without compromising animal performance. Forty yearling beef steers were fed four diets in a factorial design consisting of two legume forage species (sainfoin or alfalfa) and two preservation methods (silage or hay) over 15 weeks (wks). For each sample wk, animal weight, 24-h CH4 expiration and rumen fluid samples were obtained. Rumen methanogens were characterized using terminal restriction fragment length polymorphisms analysis. Specific bacteria were quantified with real-time polymerase chain reaction analysis. Sainfoin silage (SS) and sainfoin hay (SH) contained 11.9 and 10.5 mg g-1 of CT respectively and supported an acceptable growth rate for backgrounding steers. A decline (P < 0.05) in enteric CH4 formation could only be detected from SH-fed animals compared to alfalfa hay (AH) fed animals when CH4 was expressed as L d-1 or L kg BW-1. The rumen archaeal community structure of experimental animals remained stable regardless of diet type or sample wk. Structural carbohydrate-fermenting bacteria were suppressed in silage diets. Methanogens were less abundant in the rumen fluid samples of steers fed SS but not SH. en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject methane en_US
dc.subject condensed tannin en_US
dc.subject sainfoin en_US
dc.subject beef cattle en_US
dc.title Methane emissions and rumen microbial changes in steers fed condensed tannin containing diets under western Canadian conditions en_US
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US
dc.degree.discipline Animal Science en_US
dc.contributor.examiningcommittee Wittenberg, Karin (Animal Science) Holley, Rick (Food Science) McAllister, Tim (Agriculture and Agri-Food Canada) en_US
dc.degree.level Master of Science (M.Sc.) en_US
dc.description.note October 2011 en_US


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