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Quarterly Journal of Experimental Physiology 69.3 pp 469-475
© The Physiological Society 1984
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UREA SECRETION INTO THE COLON OF SHEEP AND GOAT

W. v. Engelhardt 1, S. Hinderer 1, G. Rechkemmer 1, and G. Becker 1

1 Department of Physiology, School of Veterinary Medicine, Hannover, and Department of Zoophysiology, University of Hohenheim, Stuttgart, F.R.G.

Total urea entry rate into the body pool and urea hydrolysis rate (transfer of endogenous urea into the total gastrointestinal (g.i.) tract) were obtained after single intravenous injections of [14C]urea and from renal urea excretion in sheep and goat. Secretion of endogenous urea into the colon was estimated from the appearance of urea N in the temporarily isolated and perfused colon. Rate of urea secretion ino the colon was rather small (0·10-0·31 mmol. h-1). It was only 0·3-1·1% of urea entry rate, or 0·4-7% of urea hydrolysis rate. Urea secretion into the colon increased linearly with increase of plasma urea concentration. Dietary conditions and short-chain fatty acid concentrations in colonic contents had no significant effect on the permeability of the colonic epithelium for urea.

Submitted on September 20, 1983




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C. E. STEVENS and I. D. HUME
Contributions of Microbes in Vertebrate Gastrointestinal Tract to Production and Conservation of Nutrients
Physiol Rev, April 1, 1998; 78(2): 393 - 427.
[Abstract] [Full Text] [PDF]


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Copyright © 1984 by the The Physiological Society.