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- W1992197980 abstract "The effect of level of nutrition on in vitro and in vivo O 2 consumption by the gastrointestinal tract in four nonlactating, nonpregnant ewes catheterized in the anterior mesenteric vein, hepatic portal vein and mesenteric artery with duodenal cannulae was investigated. Animals were fed a pelleted ration at maintenance (M) or twice maintenance (2M) or fasted (F) subsequent to the M measurement. Duodenal in vitro O 2 , ouabain-sensitive O 2 (OSO 2 ) and cycloheximide-sensitive O 2 (CSO 2 ) consumption was determined polarographically using a YSI O 2 monitor; whole-gut O 2 consumption was determined as (arterio-venous difference of O 2 concentration) × (blood flow through the PV). Whole-body O 2 consumption was determined using indirect calorimetry. Ewes fed 2M exhibited higher (P < 0.10) whole-body O 2 consumption than either M or F ewes. Ewes fed M and 2M had higher (P < 0.10) duodenal in vitro O 2 and ouabain-insensitive O 2 (OIO 2 ) consumption than F ewes. Hepatic portal blood flow was directly proportional to level of intake (P < 0.10): it was lowest for F ewes (81.0 L h −1 ), intermediate for M ewes (97.7 L h −1 ) and highest for 2M ewes (122.5 L h −1 ). Ouabain inhibition of O 2 consumption by portal-drained viscera (PDV) was highest in M ewes and lowest in 2M ewes (P < 0.10). CSO 2 consumption by the entire PDV was not affected by level of intake, corresponding to no change in OIO 2 consumption by the PDV. As a proportion of whole-body O 2 consumption, total O 2 , OSO 2 and cycloheximide-insensitive O 2 consumption by the PDV was higher in F ewes than in 2M ewes (P < 0.10). Fasted ewes expended a greater proportion of whole-body O 2 consumption on gastrointestinal energetics than did 2M ewes. Key words: Sheep, gastrointestinal oxygen consumption, sodium–potassium ATPase, protein synthesis" @default.
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- W1992197980 date "1993-12-01" @default.
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- W1992197980 title "Quantification of in vitro and in vivo energy metabolism of the gastrointestinal tract of fed or fasted sheep" @default.
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- W1992197980 doi "https://doi.org/10.4141/cjas93-088" @default.
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