title: [Passage of endogenous urea into a jejunum of sheep].
abstract: The quantitative passage of urea-N and ammonia N into an isolated jejunum of the merino sheep was studied within one hour before, and 1, 2, 3, 4 and 5 hours after feeding. The total amount of ammonia-N  that passes to the isolated jejunum [to both proximal and distal part] within an hour is small [0.28-0.35 mg h-1],  without any significant differences in passage prior to and after feeding. However, urea-N secretion is high, especially secretion to the fore part of the jejunum [ 3.35-3.62 mg h-1]. The passage of urea-N to the rear part of the jejunum is about 1/3 lower than passage to the fore part. Urea solution of higher concentration than in peripheral blood was incubated in the isolated jejunum to study an adverse phenomenon: absorption of urea from intestinal lumen to the blood. The levels of urea in peripheralblood and in incubate reached a balance state within one hour after administration. The data obtained testify to the permeability of the wall of the gut for urea in both directions.
mesh_terms: D000641:Ammonia / Q000378:metabolism; D000818:Animals; D002463:Cell Membrane Permeability; D007408:Intestinal Absorption; D007583:Jejunum / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D012756:Sheep / Q000378:metabolism*; D013997:Time Factors; D014508:Urea / Q000097:blood / Q000378:metabolism*
chemical_list: D000641:Ammonia; D014508:Urea; D009584:Nitrogen
vernacular_title: Pasáz endogénnej mocoviny do jejuna oviec.