| dc.contributor.author | Guerouali, Abdelhai | |
| dc.contributor.author | El Gass, Youssef | |
| dc.contributor.author | Balcells Terés, Joaquim | |
| dc.contributor.author | Belenguer, Álvaro | |
| dc.contributor.author | Nolan, John | |
| dc.date.accessioned | 2018-10-17T07:59:06Z | |
| dc.date.available | 2018-10-17T07:59:06Z | |
| dc.date.issued | 2004 | |
| dc.identifier.issn | 0007-1145 | |
| dc.identifier.uri | http://hdl.handle.net/10459.1/64895 | |
| dc.description.abstract | Five 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)mmol/kg body weight
(W)0·75 per d. Allantoin and xanthine þ 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 (mmol/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. | ca_ES |
| dc.description.sponsorship | The present study was supported by ACSAD and the IAEA via research contract MOR10564 (Morocco) and AA.EE/ AECI 229-188 and CICYT- PB 98-1601 (Spain). | ca_ES |
| dc.language.iso | eng | ca_ES |
| dc.publisher | Cambridge University Press | ca_ES |
| dc.relation.isformatof | Reproducció del document publicat a https://doi.org/10.1079/BJN20041208 | ca_ES |
| dc.relation.ispartof | British Journal of Nutrition, 2004, vol. 792, p. 225-232 | ca_ES |
| dc.rights | (c) Cambridge University Press, 2004 | ca_ES |
| dc.subject | Purine derivatives | ca_ES |
| dc.subject | Xanthine oxidase | ca_ES |
| dc.subject | Microbial protein | ca_ES |
| dc.subject | Camels | ca_ES |
| dc.title | Urinary excretion of purine derivatives as an index of microbial protein synthesis in the camel (Camelus dromedarius) | ca_ES |
| dc.type | info:eu-repo/semantics/article | ca_ES |
| dc.identifier.idgrec | 023007 | |
| dc.type.version | info:eu-repo/semantics/publishedVersion | ca_ES |
| dc.rights.accessRights | info:eu-repo/semantics/openAccess | ca_ES |
| dc.identifier.doi | https://doi.org/10.1079/BJN20041208 | |
