Abstract
SUMMARYSteers fed low nitrogen diets were infused intraruininally with water.Increasing the water load increased the urine volume and urinary urea excretion and depressed the plasma urea level.The effect of intraruminal water loading was studied in association with intravenous urea loading of 25 and 65 g N/day. When 25 g N/day as urea was infused intravenously, water loading did not significantly increase the urinary urea excretion but the plasma urea level was depressed. At 65 g N/day water loading increased the urinary urea excretion and decreased the plasma urea level.Significantly different relations between plasma urea and urea load existed for the ad lib. water and the water-loaded treatments but the relation between rumen ammonia level and plasma urea level was not affected by the water loading.The results are discussed with reference to the recycling of urea.
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