Hove K, Jacobsen E
Acta Vet Scand. 1975;16(4):513-9. doi: 10.1186/BF03546644.
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.
对8头9月龄驯鹿幼崽进行了尿素肾重吸收的研究，这些幼崽分别喂食低蛋白（19 - 34克粗蛋白，主要是地衣）和高蛋白（68 - 69克粗蛋白，地衣 + 豆粕）日粮。为期3个月的低蛋白日粮喂养导致肾脏对滤过尿素的平均重吸收率为93%，而高蛋白日粮组的重吸收率仅为50%。据计算，如果重吸收的尿素完全用于瘤胃中的蛋白质合成，以地衣为食的动物每天可合成4克粗蛋白。对于那些以地衣为主要食物时通常处于负氮平衡的动物来说，这一数量对其氮平衡具有非常重要的贡献。
