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Small intestinal starch digestion in steers: effect of various levels of abomasal glucose, corn starch and corn dextrin infusion on small intestinal disappearance and net glucose absorption
Small intestinal starch digestion in steers: effect of various levels of abomasal glucose, corn starch and corn dextrin infusion on small intestinal disappearance and net glucose absorption
- Source :
- Journal of Animal Science. 69:328
- Publication Year :
- 1991
- Publisher :
- Oxford University Press (OUP), 1991.
-
Abstract
- Eight Holstein steers (four at 300 kg, four at 406 kg) fitted with an elevated carotid artery, hepatic portal and mesenteric venous catheters, and abomasal and ileal cannulas were used in several 4 x 4 Latin square experiments to evaluate small intestinal starch digestion. They were fed alfalfa hay at 1.5% of BW and abomasally infused with water or glucose, corn starch or corn dextrin (one carbohydrate per Latin square) at 20, 40 or 60 g/h, with subsequent determination of small intestinal disappearance and net portal glucose absorption. Increasing the amount of all three carbohydrates infused abomasally increased the amount of carbohydrate disappearing in the small intestine. Increased infusion of glucose caused a continual increase (linear, P less than .01) in net glucose absorption, whereas net glucose absorption for starch and dextrin was maximal at the 20 g/h infusion (quadratic, P less than .05). With the 60 g/h infusion, 94% of the glucose but only 38% of starch and 29% of small intestinal dextrin disappearance could be accounted for as net glucose absorption, leaving a large portion of starch and dextrin disappearance unaccounted for. Of the infused starch and dextrin passing the ileum, 5.8 and 7.3%, respectively, was unpolymerized glucose, indicating that, at least in the distal small intestine, complete starch hydrolysis exceeded the capacity for glucose disappearance. It is concluded that only about 35% of the raw corn starch disappearing in the steer's small intestine resulted in net portal glucose absorption.
- Subjects :
- Male
Starch
Ileum
Biology
Carbohydrate metabolism
Zea mays
Intestinal absorption
Maize starch
chemistry.chemical_compound
Animal science
Dextrins
Intestine, Small
Genetics
medicine
Animals
chemistry.chemical_classification
food and beverages
General Medicine
Hydrogen-Ion Concentration
Carbohydrate
Small intestine
Glucose
medicine.anatomical_structure
Intestinal Absorption
chemistry
Biochemistry
Cattle
Digestion
Animal Science and Zoology
Dextrin
Food Science
Subjects
Details
- ISSN :
- 00218812
- Volume :
- 69
- Database :
- OpenAIRE
- Journal :
- Journal of Animal Science
- Accession number :
- edsair.doi.dedup.....f12951818b6ce771133c19c49a225ced
- Full Text :
- https://doi.org/10.2527/1991.691328x