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Effect of site of starch digestion on portal nutrient net fluxes in steers

Published online by Cambridge University Press:  08 March 2007

Pierre Nozière ,
Didier Rémond ,
Sophie Lemosquet ,
Béatrice Chauveau ,
Denys Durand  and
Claude Poncet
Pierre Nozière*
Affiliation:
Unité de Recherche sur les Herbivores, INRA Theix, 63122 St Genès Champanelle, France
Didier Rémond
Affiliation:
Unité Nutrition et Métabolisme Protéique, INRA Theix, 63122 St Genès Champanelle, France
Sophie Lemosquet
Affiliation:
Unité Mixte de Recherche Production du Lait, INRA, 35590 St Gilles, France
Béatrice Chauveau
Affiliation:
Unité de Recherche sur les Herbivores, INRA Theix, 63122 St Genès Champanelle, France
Denys Durand
Affiliation:
Unité de Recherche sur les Herbivores, INRA Theix, 63122 St Genès Champanelle, France
Claude Poncet
Affiliation:
Unité de Recherche sur les Herbivores, INRA Theix, 63122 St Genès Champanelle, France
*
*Corresponding author: Dr Pierre Nozière, fax 33 4 76 62 42 73, email nozier@clement.inra.fr
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Abstract

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Processing of maize grain is known to modulate the site of starch digestion, thus the nature and amount of nutrients delivered for absorption. We assessed the effect of site of starch digestion on nutrient net fluxes across portal-drained viscera (PDV). Three steers, fitted with permanent digestive cannulas and blood catheters, successively received two diets containing 35 % starch as dent maize grain. Diets differed according to maize presentation: dry and cracked (by-pass, BP) v. wet and ground (control, C). Ruminal physicochemical parameters were not significantly affected. Between C and BP, the decrease in ruminal starch digestion was compensated by an increase in starch digestion in the small intestine. The amount of glucose and soluble α-glucoside reaching the ileum was not affected. The amount of glucose disappearing in the small intestine increased from 238 to 531 g/d between C and BP, but portal net flux of glucose remained unchanged (−97 g/d). The portal O2 consumption and net energy release were not significantly affected, averaging 16 % and 57 % of metabolizable energy intake, respectively. The whole-body glucose appearance rate, measured by jugular infusion of [6, 6-2H2]glucose, averaged 916 g/d. The present study shows that the increase in the amount of glucose disappearing in the small intestine of conventionally fed cattle at a moderate intake level induces no change in portal net flux of glucose, reflecting an increase in glucose utilization by PDV. That could contribute to the low response of whole-body glucose appearance rate observed at this moderate level of intestinal glucose supply.

Keywords

CattleDigestionAbsorptionStarchGlucosePortal-drained viscera
Type
Research Article
Information
British Journal of Nutrition , Volume 94 , Issue 2 , August 2005 , pp. 182 - 191
Copyright
Copyright © The Nutrition Society 2005

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