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Adaptation to small intestinal starch assimilation and glucose transport in ruminants

Bauer, M.L. (University of Kentucky, Lexington.) ; Harmon, D.L ; McLeod, K.R ; Huntington, G.B

Journal of animal science, 1995-06, Vol.73 (6), p.1828-1838 [Peer Reviewed Journal]

Savoy, IL: Am Soc Animal Sci

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Title:
Adaptation to small intestinal starch assimilation and glucose transport in ruminants
Author: Bauer, M.L. (University of Kentucky, Lexington.) ; Harmon, D.L ; McLeod, K.R ; Huntington, G.B
Subjects: ABSORCION DIGESTIVA ; ABSORPTION DIGESTIVE ; ADAPTACION ; ADAPTATION ; Adaptation, Physiological - physiology ; ALMIDON ; AMIDON ; Animal productions ; Animals ; ARTERE ; ARTERIAS ; AZUCAR EN SANGRE ; Biological and medical sciences ; Biological Transport - physiology ; BOVIN ; Carbohydrates ; Cattle ; Cattle - metabolism ; Cattle - physiology ; CIRCULACION SANGUINEA ; CIRCULATION SANGUINE ; Cross-Over Studies ; DEBIT ; Diet ; Feeding. Feeding behavior ; FOIE ; Fundamental and applied biological sciences. Psychology ; GANADO BOVINO ; GASTO ; GLICOSIDOS ; GLUCOSA ; GLUCOSE ; Glucose - metabolism ; Glucose - pharmacokinetics ; GLYCOSIDE ; HIGADO ; HYDROLYSAT DE PROTEINES ; INTESTIN ; Intestine, Small - metabolism ; Intestine, Small - physiology ; INTESTINOS ; Lactates - metabolism ; Male ; METABOLITE ; METABOLITOS ; NUTRIENTES ; ORINA ; OVIN ; OVINOS ; Phlorhizin - pharmacology ; PROTEINAS HIDROLIZADAS ; Sheep ; Sheep - metabolism ; Sheep - physiology ; Small intestine ; Starch - metabolism ; Starch - pharmacokinetics ; SUBSTANCE NUTRITIVE ; SUCRE DU SANG ; Terrestrial animal productions ; URINE ; VEINE ; VENAS ; Vertebrates ; Vertebrates: anatomy and physiology, studies on body, several organs or systems
Is Part Of: Journal of animal science, 1995-06, Vol.73 (6), p.1828-1838
Notes: 9555817
L51
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
ObjectType-News-3
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Description: Four crossbred steers (380 +/- 6 kg) and seven Polypay wethers (40.3 +/- 0.6 kg) fitted with hepatic venous, hepatic portal, mesenteric venous and arterial, ruminal, and abomasal (steers) or duodenal (wethers) catheters were used in two crossover design experiments to evaluate adaptation to small intestinal starch and glucose transport. Steers were fed 8.6 kg/d and sheep were fed 0.9 kg/d of alfalfa hay in 12 equal portions and infused with an alpha-amylase partial starch hydrolysate (SH) either postruminally (adapted) or ruminally (unadapted) for 4 (steers; 40 g/h) or 5 (sheep; 6 g/h) days before measuring splanchnic flux of metabolites. On the day of flux measurements, ruminal SH infusion was switched to the postruminal site in unadapted animals. Flux measurements were made 3 to 6 h after switching infusion site for steers and 2 to 5 h for sheep. Phlorizin, a competitive inhibitor of Na/glucose cotransport, was then postruminally infused (550 and 500 micromoles/h for steers and sheep, respectively) and flux measurements repeated from h 9 to 12 (steers) and h 7 to 10 (sheep). In the steers, adaptation increased (P less than or equal to 0.09) portal-drained visceral (PDV) glucose release 26 mmol/h and decreased hepatic uptake of lactate 20 mmol/h. Abomasal infusion of phlorizin decreased (P = 0.01) net PDV glucose flux 40 mmol/h and concomitantly increased (P = 0.05) hepatic release of glucose by 47 mmol/h. In sheep, duodenal infusion of phlorizin increased (P less than or equal to 0.005) portal and hepatic blood flow and decreased (P less than or equal to 0.02) PDV release of glucose and lactate by 9 and 0.4 mmol/h, respectively. The liver released 4.2 mmol/h more (P = 0.09) glucose and removed 3.2 mmol/h more lactate (P = 0.001); arterial glucose decreased (P = 0.003) 0.75 mM in response to phlorizin. Phlorizin also caused loss of glucose in the urine of sheep (.09 mmol/h). Adaptation did not alter net splanchnic flux of glucose, lactate, oxygen, or alpha-amino N
Publisher: Savoy, IL: Am Soc Animal Sci
Language: English

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Adaptation to small intestinal starch assimilation and glucose transport in ruminants

Bauer, M.L. (University of Kentucky, Lexington.) ; Harmon, D.L ; McLeod, K.R ; Huntington, G.B

Savoy, IL: Am Soc Animal Sci

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