Nitrogen utilization within equine large intestine.

The American Journal of Physiology
J F Wootton, R A Argenzio

Abstract

The distribution of nitrogen in ligated segments of the stomach and intestine of two groups of ponies has been examined at sacrifice 2, 4, 8, and 12 h following the final 12-h scheduled feeding of diets designed to provide either 1) ample protein, or 2) limited protein plus supplemental urea as the major nitrogen source. Concentrations and total quantities of total N, NH3, urea plus NH3, and alpha-amino N were determined, and protein N was calculated by difference. Liquid marker (PEG) distribution rate constants and N concentrations were used to calculate rates of entry and exit by digesta flow for the large intestinal compartments. These values, together with measured accumulations of each constituent, allowed assessment of transitory net appearance and net disappearance within each compartment due to processes other than flow along the tract. The data suggested cyclic fluctuations of microbial populations within the large intestine, particularly the dorsal and ventral colon. These segments also were implicated as major sites of microbial protein synthesis and degradation. the former process appeared more evident in animals consuming the urea-supplemented diet.

Citations

Apr 1, 1982·Equine Veterinary Journal
Feb 14, 1998·Anatomia, histologia, embryologia·K H Wille, M Zahner
Jan 1, 2011·Animal : an International Journal of Animal Bioscience·A S SantosW Martin-Rosset
Jun 20, 2015·Journal of Nutritional Science·Annette ZeynerEllen Kienzle
Jan 1, 1984·The Proceedings of the Nutrition Society·R A Argenzio, C E Stevens
Nov 1, 1979·The American Journal of Physiology·A F SellersJ Brondum
Dec 1, 1985·Applied and Environmental Microbiology·A E MaczulakJ P Baker

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