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In order to simulate daily episodes of high ammonia (NH4 +) absorption associated with the intake of diets with high content of non-protein N or rapidly rumen degradable protein, four wethers (42±3.4 kg BW), surgically fi tted with indwelling catheters in the posterior aorta and splanchnic veins, were infused with 340 μmol NH4 HCO3 -/min into the mesenteric vein for 3 h, over 7 consecutive days. On the 7th day, net mass transfers of NH4 +, urea, glucose, lactate, ß-OH-butyrate and oxygen were measured across portal-drained viscera (PDV), liver and splanchnic tissues during the last 90 min of the NH4 + infusion (NH4 + treatment, AT). Measurements were repeated on the following day, after withdrawal of the NH4 + infusion (Control treatment, CT). NH4 + infusion increased liver NH4 + uptake (+396 μmol/min; sed, 72; P=0.04) and urea production (+152 μmol/min; sed, 55; P=0.14), and oxygen consumption by the liver (+151 μmol/min; sed, 6; P=0.002), the PDV (+224 μmol/min; sed, 56; P=0.03) and the splanchnic tissues (+352 μmol/min; sed, 57; P=0.009). Net mass transfers of glucose, lactate and ß-OH-butyrate across the PDV and the liver, and the acid-base status of the animals were unchanged.

Splanchnic net balance of oxygen and metabolites in response to mesenteric vein infusion of ammonia in sheep