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Browsing by Author "Wallace, R. John"

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Adaptation to flavomycin in the ruminal bacterium, Prevotella bryantii

Edwards, Joan E.; McEwan, Neil R.; Wallace, R. John (2008-06-01)

Aims: The recent EU ban of growth-promoting antibiotics in animal production was based on fears concerning antibiotic resistance being transmitted to human pathogens. This paper explores the adaptation mechanism of a common ...
Clostridium proteoclasticum: a ruminal bacterium that forms stearic acid from linoleic acid

Paillard, Delphine; Richardson, Anthony J.; Walker, Nicola D.; McKain, Nest; McEwan, Neil R.; Wallace, R. John; Vercoe, Philip E.; Chaudhary, Lal C. (2006-10-18)

The aim of this study was to identify ruminal bacteria that form stearic acid (18 : 0) from linoleic acid (cis-9,cis-12-18 : 2). One 18 : 0-producing isolate, P-18, isolated from the sheep rumen was similar in morphology ...
Fish Oil Increases the Duodenal Flow of Long Chain Polyunsaturated Fatty Acids and trans-11 18:1 and Decreases 18:0 in Steers via Changes in the Rumen Bacterial Community

Kim, Eun J.; Huws, Sharon A.; Lee, Michael R. F.; Wood, Jeff D.; Muetzel, Stefan M.; Wallace, R. John; Scollan, Nigel D. (2008-05-01)

Ruminant fat is rich in SFA, partly due to the biohydrogenation of dietary PUFA to SFA in the rumen. This process can be inhibited by the dietary inclusion of fish oil. The only bacteria isolated from the rumen capable of ...
Forage type and fish oil cause shifts in rumen bacterial diversity

Huws, Sharon A.; Lee, Michael R. F.; Muetzel, Stefan M.; Scott, Mark B.; Wallace, R. John; Scollan, Nigel D. (2010-08-01)

Despite evidence supporting improved incorporation of beneficial polyunsaturated fatty acids (PUFA) into ruminant products, such as meat and milk, following red clover and fish oil (FO) inclusion in the ruminant diet, ...
Relation between phylogenetic position, lipid metabolism and butyrate production by different Butyrivibrio-like bacteria from the rumen

Chaudhary, Lal C.; Koppova, I.; Paillard, Delphine; Vercoe, P. E.; Pizette, F.; McKain, Nest; Louis, P.; Walker, N. D.; McEwan, Neil R.; Kopecny, J.; Wallace, R. John (2007-05)

The Butyrivibrio group comprises Butyrivibrio fibrisolvens and related Gram-positive bacteria isolated mainly from the rumen of cattle and sheep. The aim of this study was to investigate phenotypic characteristics that ...
Rumen ciliate protozoa contain high concentrations of conjugated linoleic acids and vaccenic acid, yet do not hydrogenate linoleic acid or desaturate stearic acid

Devillard, Estelle; McIntosh, Freda M.; Newbold, C. James; Wallace, R. John (2006-10)

Conjugated linoleic acids (CLA) have been shown to improve human health. They are derived from the microbial conversion of dietary linoleic acid (cis-9,cis-12-18 : 2 (LA)) in the rumen. An investigation was undertaken to ...
Rumen protozoa are rich in polyunsaturated fatty acids due to the ingestion of chloroplasts

Huws, S. A.; Kim, E. J.; Kingston-Smith, A. H.; Lee, M. R. F.; Muetzel, Stefan M.; Cookson, A. R.; Newbold, C. J.; Wallace, R. John; Scollan, N. D. (2009-09)

Within this study, we investigated whether the polyunsaturated fatty acids (PUFA)-rich nature of rumen protozoa is a consequence of ingestion of PUFA-rich chloroplasts. Four Hereford × Friesian steers were offered hay [low ...
Understanding the role of bacteria in the biohydrogenation pathways within the rumen

Huws, Sharon A.; Wallace, R. John; Scollan, Nigel D.; Lee, Michael R. F.; Pinloche, Eric; Kim, Eun J. (2008-07-01)

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