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Title

Urinary excretion of purine derivatives as an index of microbial protein synthesis in the camel (Camelus dromedarius)

AuthorsGuerouali, Abdelhai; El Gass, Youssef; Balcells, Joaquín; Belenguer, Álvaro CSIC ORCID ; Nolan, John
KeywordsPurine derivatives
Xanthine oxidase
Microbial protein
Camels
Issue Date2004
PublisherCambridge University Press
CitationBritish Journal of Nutrition 92(2): 225-232 (2004)
AbstractFive experiments were carried out to extend knowledge of purine metabolism in the camel (Camelus dromedarius) and to establish a model to enable microbial protein outflow from the forestomachs to be estimated from the urinary excretion of purine derivatives (PD; i.e. xanthine, hypoxanthine, uric acid, allantoin). In experiment 1, four camels were fasted for five consecutive days to enable endogenous PD excretion in urine to be determined. Total PD excretion decreased during the fasting period to 267 (SE 41.5) micromol/kg body weight (W)0.75 per d. Allantoin and xanthine + hypoxanthine were consistently 86 and 6.1 % of total urinary PD during this period but uric acid increased from 3.6 % to 7.4 %. Xanthine oxidase activity in tissues (experiment 2) was (micromol/min per g fresh tissue) 0.038 in liver and 0.005 in gut mucosa but was not detected in plasma. In experiment 3, the duodenal supply of yeast containing exogenous purines produced a linear increase in urinary PD excretion rate with the slope indicating that 0.63 was excreted in urine. After taking account of endogenous PD excretion, the relationship can be used to predict purine outflow from the rumen. From the latter prediction, and also the purine:protein ratio in bacteria determined in experiment 5, we predicted the net microbial outflow from the rumen. In experiment 4, with increasing food intake, the rate of PD excretion in the urine increased linearly by about 11.1 mmol PD/kg digestible organic matter intake (DOMI), equivalent to 95 g microbial protein/kg DOMI.
Description8 pages, 4 tables, 3 figures.--PMID: 15333153 [PubMed].
Publisher version (URL)http://dx.doi.org/10.1079/BJN20041208
URIhttp://hdl.handle.net/10261/12129
DOI10.1079/BJN20041208
ISSN0007-1145
Appears in Collections:(IGM) Artículos

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