Nitrogen metabolism and kidney function in the nubian ibex (Capra ibex nubiana)

I. Choshniak*, H. Arnon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


1. 1. The nitrogen economy of the Nubian ibex (Capra ibex nubiana), a ruminant that inhabits harsh deserts, was studied in the laboratory when fed three diets of different quality. 2. 2. Even on the low quality roughage (wheat straw) the ibex was found capable of balancing its nitrogen economy. 3. 3. On feeds low in protein, recycling of urea played a major role in helping the ibex maintaining a balanced nitrogen metabolism. When on wheat straw, the ibex recycled 71.6% of the urea synthesized in its liver. 4. 4. When on feeds lower in protein, blood urea concentration dropped (from 11.4mM when on alfalfa hay to 3.2 mM when on wheat straw). GFR that amounted to 44.28 ml/min when on alfalfa hay decreased to 28.97ml/min when on wheat straw. 5. 5. Reabsorption of urea amounted to 48% of the urea filtered when on alfalfa hay and increased to 78.8% on wheat straw.

Original languageEnglish
Pages (from-to)137-139
Number of pages3
JournalComparative Biochemistry and Physiology -- Part A: Physiology
Issue number1
StatePublished - 1985


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