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Glucose Absorption and Starch Digestion in the Intestine of the Chicken¹

Institute of Animal Science, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

Starch digestion and glucose absorption were determined in vivo along the chick's (Gallus domesticus) intestine, using ⁹¹Y and ⁵¹Cr-EDTA as unabsorbed reference substances. About 65% of the ingested starch was digested up to the end of the duodenum, 85% up to the end of the jejunum and about 97% at the terminal ileum. A fraction of about 97% of the glucose, ingested or released from ingested starch, was absorbed. The duodenum was the major site of glucose absorption which continued at a decreased rate down the small intestine. Glucose absorption increased linearily with luminal concentration with no indication of saturation. The apparent permeability for glucose was similar for the jejunum and ileum.

KEY WORDS: • glucose absorption • starch digestion • chicken

¹ Contribution from the Agricultural Research Organization. The Volcani Center, Bet Dagan, Israel. No. 149-E, 1979 series.

² Present address: Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel.

³ To whom reprint requests should be sent.

Manuscript received 22 May 1979.