Renal Excretion of Urea in Reindeer Effect of Nutrition |
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Authors: | Hove Knut Jacobsen Endre |
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Affiliation: | 1.Institute of Medical Biology, University of Tromsø, the Norwegian State Reindeer Research, 9400, Harstad, Norway ;2.Department of Physiology, Veterinary College of Norway, Oslo, Norway ; |
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Abstract: | Renal reabsorption of urea was studied in 8 9-month old reindeer calves fed low protein (19–34 g crude protein, mostly lichens) and high protein (68–69 g crude protein, lichens + soybean meal) diets. Low protein diets fed for a 3-month period resulted in an average renal reabsorption of 93% of the filtered urea, while only 50 % was reabsorbed on the high protein ration. It was calculated that if the reabsorbed urea was used completely for protein synthesis in the rumen, 4 g crude protein could be made daily in the lichen fed animals. This amount would be a very significant contribution to the nitrogen economy of animals which are usually in a negative nitrogen balance when lichens are the main food consumed. |
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