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Evaluation of Nutrient Utilization in the Canine Using the Ileal Cannulation Technique^1,2,3,

Julie A. Walker^*, David L. Harmon^*,4, Kathy L. Gross and George F. Collings

^* Department of Animal Sciences, University of Kentucky, Lexington, KY 40546 Mark Morris Associates, Topeka, KS 66601

Nine mature mongrel dogs were used to evaluate a surgical technique for the cannulation of the terminal ileum and used in two experiments to determine the effect of carbohydrate source on starch and dry matter digestion. Dogs (16.2 ± 2.0 kg body weight; means ± SD) were fitted with an ileal T-cannula constructed of polyvinyl chloride pipe. The cannula was inserted into the terminal ileum 10 cm proximal to the ileocecal junction and the cannula was exteriorized through a small incision on the right flank. Dogs recovered quickly from surgery (5 d). A preliminary study using Cr:EDTA in the food indicated that sampling for 12 h postprandially allowed near complete representation of digesta flow for a meal; peak flow occurred 4- to 8-h postfeeding. Two experiments were performed evaluating the effect of carbohydrate source on ileal starch and dry matter digestibility. Dogs were fed two meals daily with Cr₂O₃ used as a digesta marker. Diets contained 67% extruded grain (corn, rice, oats or barley) and 33% canned meat supplement on a dry matter basis. Starch digestion was complete (>98%) within the small intestine and was unaffected by carbohydrate source. In experiment 1, prececal and total tract dry matter digestibilities were higher for rice than corn, and in experiment 2, barley was higher than oats. The ileal T-cannula allows for measurement of small intestinal nutrient disappearance without the confounding effects of colonic microflora. This method may be useful when applied to the study of other nutrients in dogs.

KEY WORDS: • dogs • ileum • cannulation • digestion • starch

¹ Presented as part of the Waltham Symposium on the Nutrition of Companion Animals in association with the 15th International Congress of Nutrition, at Adelaide, SA, Australia, on September 23–25, 1993. Guest editors for this symposium were Kay Earle, John Mercer and D'Ann Finley.

² Portions of this data were presented previously: Walker, J. A., Harmon, D. L., Gross, K. L. and Collings, G. (1993) Effect of carbohydrate source on starch digestibility in the dog. J. Anim. Sci. 71(suppl. 1): 159.

³ Approved by the Director of the Kentucky Agricultural Experiment Station as Publication No. 93-5-166.

⁴ To whom correspondence should be addressed: 805 W.P. Garrigus Bldg., University of Kentucky, Lexington, KY 40546.

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